windows is going crazy. help me.

It all started with adobe acrobat 6 pro not working.

Here's the summary - acrobat was not working. I tried with previous
version (5). didt work, So I downloaded acrobat 7 which worked but still the print function was not working. when I tried to cancel it, it froze.
I tried uninstalling acrobat 7, went upto 80% and gave an error.

After that, netscape also freezes. The home page opens alright, if I click back, it freezes.
yahoo messenger also started to freeze once it got connected.
I can't install anything now. I have to goto safe mode to install/uninstall anything.
I couldn't uninstall acrobat 7 even in safe mode.

Seems like all this is like a trailor to a nightmare.
what can I do now, other than formatting?