One by one I disabled all mods to find out the issue such as vbseo,everywheresidebar, Guest Redirection System Professional. And came to know only Guest Redirection System Professional mod was giving issue then I disabled this mod and enabled all other mods.

And after this I found that my custom page is not showing. I did not disable any plugin etc of custom page.

I only disabled this Guest Redirection System Professional
Guest Redirection System Professional

Check your error_logs (if you don't know where they are, ask your host) and see if there is anything in there at the time you go to that page. Otherwise, go through the installation instructions again and reinstall it.

I have enabled this mod but the error still there. I cannot open .php files.
Is this because I disabled and then enabled VBSEO

I told you what to do and it doesn't sound like you did either of the things I said to do.

ok I will check or will it be ok to create custom page again from scratch

--------------- Added [DATE]1306781303[/DATE] at [TIME]1306781303[/TIME] ---------------

I could not understand properly. Can I create my custom page again or please clarify what I have to do to solve this error

I'm saying:
1) Check your error_logs (if you don't know where they are, ask your host). There may be something in there to tell you why the page is not working.

2) Try going through the installation instructions again and make sure it is properly installed.

3) If neither of those help you out, then here is a page from the manual about troubleshooting blank or 'white' pages: http://www.vbulletin.com/docs/html/blank_pages

Hi
I have run the suspect file version and got this errors

Pl. help me

Scanned 86 files./

gdirect.php File not recognized as part of vBulletin
member_inlinemod.php File not found
moderation.php File not found
sendmessage.php File not found
showgroups.php File not found
we-support.php File not recognized as part of vBulletin
Scanned 71 files./admincp
Scanned 3 files./archive
Scanned 99 files./clientscript
Scanned 2 files./clientscript/ie7
Scanned 2 files./clientscript/ie8
Scanned 8 files./clientscript/jquery
Scanned 2 files./clientscript/libraries
DD_belatedPNG_0.0.8a.js File does not contain expected contents
Scanned 2 files./clientscript/yui
Scanned 2 files./clientscript/yui/animation
Scanned 5 files./clientscript/yui/assets/skins/sam
Scanned 1 files./clientscript/yui/colorpicker
Scanned 1 files./clientscript/yui/colorpicker/assets
Scanned 2 files./clientscript/yui/colorpicker/assets/skins/sam
Scanned 3 files./clientscript/yui/combo
Scanned 2 files./clientscript/yui/connection
Scanned 3 files./clientscript/yui/container
Scanned 2 files./clientscript/yui/container/assets
Scanned 2 files./clientscript/yui/container/assets/skins/sam
Scanned 2 files./clientscript/yui/dragdrop
Scanned 1 files./clientscript/yui/element
Scanned 2 files./clientscript/yui/history
Scanned 2 files./clientscript/yui/history/assets
Scanned 1 files./clientscript/yui/json
Scanned 2 files./clientscript/yui/menu
Scanned 3 files./clientscript/yui/menu/assets
Scanned 3 files./clientscript/yui/menu/assets/skins/sam
Scanned 2 files./clientscript/yui/reset-fonts
Scanned 1 files./clientscript/yui/slider
Scanned 2 files./clientscript/yui/slider/assets
Scanned 1 files./clientscript/yui/slider/assets/skins/sam
Scanned 2 files./clientscript/yui/treeview
Scanned 3 files./clientscript/yui/treeview/assets
Scanned 2 files./clientscript/yui/treeview/assets/css/folders
Scanned 3 files./clientscript/yui/treeview/assets/skins/sam
Scanned 2 files./clientscript/yui/uploader
Scanned 1 files./clientscript/yui/utilities
Scanned 2 files./clientscript/yui/yahoo-dom-event
Scanned 2 files./clientscript/yui/yuiloader-dom-event
Scanned 2 files./cpstyles
Scanned 2 files./images/regimage/fonts
Scanned 194 files./includes
class_core.php File does not contain expected contents
Scanned 4 files./includes/api
Scanned 191 files./includes/api/1
Scanned 22 files./includes/api/2
Scanned 7 files./includes/block
Scanned 25 files./includes/cron
vbseo_serviceupdate.php File not found
Scanned 2 files./includes/facebook
Scanned 8 files./includes/paymentapi
Scanned 29 files./includes/xml
cssrollup_vbseo.xml File not recognized as part of vBulletin
Scanned 16 files./install
Scanned 3 files./install/cmsdefaultdata
Scanned 76 files./install/includes
Scanned 11 files./modcp
Scanned 5 files./packages/skimlinks/hooks
Scanned 2 files./packages/vbattach
Scanned 2 files./packages/vbblog/attach
Scanned 3 files./packages/vbblog/search/indexcontroller
Scanned 3 files./packages/vbblog/search/result
Scanned 2 files./packages/vbblog/search/searchcontroller
Scanned 3 files./packages/vbblog/search/type
Scanned 2 files./packages/vbblog/taggablecontent
Scanned 11 files./packages/vbcms
Scanned 2 files./packages/vbcms/attach
Scanned 3 files./packages/vbcms/bbcode
Scanned 2 files./packages/vbcms/bbcodehelper
Scanned 2 files./packages/vbcms/bbcodehelper/table
Scanned 4 files./packages/vbcms/collection
Scanned 5 files./packages/vbcms/collection/content
Scanned 5 files./packages/vbcms/content
Scanned 7 files./packages/vbcms/controller
Scanned 7 files./packages/vbcms/dm
Scanned 2 files./packages/vbcms/editor
Scanned 2 files./packages/vbcms/exception
Scanned 5 files./packages/vbcms/item
Scanned 5 files./packages/vbcms/item/content
Scanned 23 files./packages/vbcms/item/widget
Scanned 5 files./packages/vbcms/route
Scanned 3 files./packages/vbcms/search/indexcontroller
Scanned 4 files./packages/vbcms/search/result
Scanned 4 files./packages/vbcms/search/searchcontroller
Scanned 3 files./packages/vbcms/search/type
Scanned 2 files./packages/vbcms/taggablecontent
Scanned 6 files./packages/vbcms/view
Scanned 23 files./packages/vbcms/widget
Scanned 5 files./packages/vbdbsearch
Scanned 4 files./packages/vbforum/attach
Scanned 3 files./packages/vbforum/collection
Scanned 3 files./packages/vbforum/item
Scanned 6 files./packages/vbforum/search/indexcontroller
Scanned 10 files./packages/vbforum/search/result
Scanned 4 files./packages/vbforum/search/searchcontroller
Scanned 11 files./packages/vbforum/search/type
Scanned 3 files./packages/vbforum/taggablecontent
Scanned 24 files./vb
Scanned 3 files./vb/cache
Scanned 2 files./vb/cache/observer
Scanned 3 files./vb/collection
Scanned 3 files./vb/controller
Scanned 4 files./vb/db
Scanned 4 files./vb/db/mysql
Scanned 15 files./vb/exception
Scanned 3 files./vb/item
Scanned 11 files./vb/legacy
Scanned 3 files./vb/route
Scanned 11 files./vb/search
searchtools.php File does not contain expected contents
Scanned 4 files./vb/search/indexcontroller
Scanned 2 files./vb/search/result
Scanned 2 files./vb/search/searchcontroller
Scanned 2 files./vb/search/type
Scanned 2 files./vb/templater
Scanned 6 files./vb/view
Scanned 18 files./vbseo/includes
functions_vbseo_ui.php File not recognized as part of vBulletin
functions_vbseo_ui_profile.php File not recognized as part of vBulletin
md5_sums_crawlability_vbseo.php File not found
vbseo_serviceupdate.php File not recognized as part of vBulletin
Scanned 20 files./vbseo/resources/xml
.htaccess File not found
config.xml File does not contain expected contents
vbseo_urls_007.xml File not recognized as part of vBulletin
vbseocp_romanian.xml File not recognized as part of vBulletin
vbseocp_russian_utf-8.xml File not recognized as part of vBulletin
vbseocp_turkce_utf-8.xml File not recognized as part of vBulletin

OK. You have some default file that are labeled "file not found". You have some with "does not contain expected contents". You should upload those default files. I don't know that they have anything to do with your issue though.

Please please help me out

I don't know where to get these default files. I didi not delete any important default files
member_inlinemod.php File not found
moderation.php File not found
sendmessage.php File not found
showgroups.php File not found

This page is not visible
http://college-chat-rooms.gradchat.net/we-support.php

I don't think those files have anything to do with the issue. I suggest you go over item 1 and 2 that I posted.