Since you are having problems I wouldn't put it into the main folder until it is running right.
For now I would create a folder in your root directory called social, so you'd have
www.xxx.com/social. Upload all the files there, keeping them in their current directories.
During installation select the Vbulletin forum option and the path should be
../forums/ When you click continue then you should see a list of the admin's of the forum to select from. If you see this then the forum should work. If you don't then the path is wrong or your forum config is somewhere else.
If you are having problems uploading an mp3 or image then make sure the permissions are set to 755 on the /mp3 and all the image subdirectories.
Again, if you want you can upload the files and pm me the location, I'll do the install and see if I come across any gotcha's.