site hacked badly

[Marlow]

My site www.carreraforbundet.net is hacked.

I have an old version in Invisionboard installed on my site
http://www.carreraforbundet.net/forums/ that has been hijacked by some hackers, visitors to the board get forwarded to another site, http://www.cagdashosting.com/w.htm

Also, visitors get virus warnings.

Please help, how do I solve this?

[the_ancient]

Looks like and Invision board,

The first thing you need to do is delete all the effected files, RIGHT NOW,

Then you probally need to contact support and inform them so they can make sure no other accounts on your server have been effected

Then you need to find out how they hacked it,

then you need to redo your web site