IE and Norton not working on my computer.

IE not working, but I can go online with AOL.  Norton of course not working now because IE stopped running...  HELP!

I have been having a lot of trouble with my computer for about 8 months now.  The trouble started right around the time Norton notified me that a "Heuristic Virus" was "removed from my computer.  The trouble started with IE freezing, then the computer would randomly shut down, a few times it wouldn't even boot up.  I did system recovery like 10 different times.  Now my computer is completely vulnerable and I can't even update any of my programs because they load through IE....  Please help!