Hi Ozzy, I've sorted it out out now.
The error that I was getting was this
Javascript support within your browser may be disabled; this is required to continue. If javascript is enabled, verify that this file is in place:
I then found a thread by TheLastSuperman
http://www.vbulletin.com/forum/blogs...vbulletin-site and followed the info on there. Deleted everythig from the server root and reuploaded the files, then used the upgrade tab in admincp. This time it worked. There must have been a corrupt file left by the hackers that I had missed. Everything is back to normal now... and installs folder deleted!!!!
Thanks for the reply.