Problem with forum please help

[cshellworld]

hello , i have a error on forums and i don't know what happening but yesterday forum works excellent

now i have this error
Parse error: syntax error, unexpected T_ENCAPSED_AND_WHITESPACE /home/userxxx/public_html/index.php on line 1

where i can find a solutions ? or what is making this error
vbulletin version 4.2.2 pl1

Thanks

[Lynne]

Did you edit your index.php file yesterday at all? Take a look at it and see if someone else did.

[cshellworld]

i am the only one with acces to do that, i haven't made any changes for a month now.

[Lynne]

Then like I said, have you looked at the index.php file today and seen if someone hacked it?