With this minimum amount of info I can only advise you this:
Boot in Safe Mode.
Uninstall ANYTHING to do with Yahoo/Yahoo! or whatever it calls itself.
Then delete all directories from Yahoo, with everything in it, including the directory itself.
Clean your \winnt\system32\drivers\etc\HOSTS file (use Notepad) so it has only one entry in it:
127.0.0.1 localhost
Save it, then set the attributes (file Properties) to
ReadOnly.
Delete everything in your \Documents & Settings\[username]\Local Settings\Temp
Clean your temporary internet files and cookies.
I don't understand this line:
Snicks said:
There is no antivirus cose since this virus my NAV cimply disaprears from tray when i roll over.
Are you saying that NAV disappears from the system-tray when you go over it with your mouse?
Click on Start/Run and type in
msconfig then hit enter. Check all the programs that automatically start. UN-check any program that you don't know or find suspicious.
Then reboot in safe mode, run Hijackthis and post the log here as before, with a .txt extension.
This is a fairly complicated process, but have a look at this post here in another forum, scroll down until the first post from Site Moderator
taz71498.
Follow it from there, run that
findit program and compare your own findings with that in the post..
If you have anything similar, sign up to that forum and post your problem there. They have more knowledge.
http://computercops.biz/postlite93976-.html