Bad Ram Stick - Corrupted Registry

Wow! What a mess. One of my ram sticks went bad and was causing Windows XP from loading. I removed it (now I'm down to 1.87gb) and now my computer is totally screwed up. It is so weird, some programs will load and others will not, or instance I can no longer use Internet Explorer (but Safari will work). Microsoft Word will work (but I can't copy and paste anything and I get an error saying I can't link to other programs) but Excel will not. System Mechanic 2.0 will work, but System Mechanic 9 will not. I no longer have any sound or printers. I'm assuming my Registry has become corrupted. Anyone have any ideas?

Additional info... System Restore was turned off. And for whatever reason, PC Angel is now "protecting" my system and giving me fits on trying to find an old copy of my Registry. If anyone has any ideas, I'd really appreciate some direction...

Thanks!!!

-Jim