Antivirus 2011 and versions are pretty horrible. The longer you leave them on there, the worse they get. Depending on how long you've left it on there, one of the few options left would be strapping the hard drive to another PC. There's simply not an easy way to get this thing off the PC it's attached itself to.
I've noticed Antivirus 2011 is really running rampant in Google image search right now. If you get that pop-up that closes your browser and tells you it needs to scan system files, just close your browser through task manager. Yes means yes, no means yes and [X] means yes.
Edit: SkittyOnWailord brought up ALT+F4, and that also means yes...
In that aforementioned post, MalwareBytes is a great program. It's known to get stuff the bigger AVs miss. I suggest running it after you run Avast!. Super Anti-Spyware is also pretty good. They're both in a list of AVs I have for disinfection usage.
:025ball:
If you can get to safe mode (NO networking), then do that, but if you can't, try to do it from normal boot:
Starting off with Start => Run => MSCONFIG, startup tab:
Anything with random letters just uncheck. Anything with "unknown" that you don't know the name of, might wanna uncheck. You're gonna have to stretch the command portion, but anything with rundll32.exe you might want to uncheck. Anything with "filename",
Startup uncheck.
Now I'm a techie, and I'll actually follow those command filenames back to the source...(IE C:\Windows\adkjfad.exe) and try to delete it from there.
Changing things and applying the settings in MSCONFIG requires a restart - restart either to safe mode with networking or normal boot.
If you can get to the Internet (if the virus hasn't already changed the proxy for your browsers yet...), then download Avast! antivirus. This AV is very useful in the way that it has "boot-time" scanning. Scans before getting into Windows so viruses don't have the chance to start yet.
If you can't get to the Internet, I'd suggest putting it on a CD (as to not risk the security of a flash drive) from another computer to install it.
If you download then it won't let you install/run it in either mode...uh...it's probably about time to go have someone strap the hard drive into another computer and try to disinfect it that way. (Connect hard drive, schedule boot scan for connected hard drive letter, restart, run several more virus scans on it - fairly easy MOST OF THE TIME, but last resort.)
Here's directions for performing a boot-time scan through Avast!. I personally don't use this AV so I'm not sure if this is out of date...but if it is, it shouldn't have changed much.
http://www.schmahl.net/avastbootscan.php
You also have to manually take care of infected files when Avast! finds them. This is a guide that generally explains that here.
http://help.artaro.eu/index.php/gen...rams/avast-free-antivirus-boot-time-scan.html
I would try running another scan of Avast! after that, then MalwareBytes and possibly even another AV after this like AVG. Multiple AVs searching does more good than you'd think, though it takes hours and hours.
As for registry files, they're very iffy. I really wouldn't suggest an average-level user to mess with them as you can turn things sour very quickly. This includes those programs that clean the registry; they're known for messing things up too.
Anyway, I hope you can get it fixed (if you haven't already lol, it's been three days).