My problem is that explorer.exe is crashing over and over to the point where I can't even open my internet browser. This just started happening and it happens every time it runs. Right now I am online via my steam browser in mw2. I had a virus a little while ago but I cleared it out. What do I do?
You can't run the graphical user interface if the explerer.exe process is stopped.
Explorer.exe is a very important process of the Windows OS and you'll have very limited functionality with it not running.
The best thing to do is to reinstall. It is possible that some files (including explorer.exe) have been modified by the virus that you had or by the antivirus that you used for cleaning. Also, some files may have been moved to quarantine or deleted.
Are you sure that the virus is gone? Even if it's gone maybe you still have malware.
Do you have an antivirus running? Which one? Do another full scan. Then reinstall.