If you can't boot you should try a boot CD. http://falconfour.com/projects/7
i've used this one and it's pretty damn good for sorting out boot issues let alone viruses there's a lot of tools and will often let you install anti-V to scan as well. Select the 'Mini XP' As you can tell it's pretty much just a cut down version of windows xp.
Or a simple way just boot into safe-mode and, like the other chap said install malwarebytes and scan your pc! Should get rid of everything. Use This uninstaller.http://www.revouninstaller.com/revo_uninstaller_free_download.html
At the bottom download the portable version and put it on a memory stick and put it on your infected pc. Run it, then once open select hunter mode (i think it's a little radar) a little icon will appear on the pc. Click and drag it to the pop up which comes up. Then it'll search for files and uninstallers for it. Helps me get rid of popups andmalware on my pc so i hope this helps you!