Help with ie6, wmc, and sys restore on XPSP2

I have XP SP2 and most of the updates until around 9/1/05. I found a virus
with avast home edtion and deleted the file and now I have some problems. I
can't run system restore. The first time I try to open the application I get
a thinking icon and then nothing. The second time I get an empty window that
never brings up any text or buttons.

I can't open some pages with IE6 including windows update and most drop down
menus aren't visible, but when I open with firefox they are fine. Some pages
don't even load like hotmail and windows update. I tried to reinstall ie6 by
editing the registry per a tech note but it didn't work so I restored the
registry to previous settings.

I also get a message "An Internal Application error has occured" when I try
to open windows media player. I tried to roll back to 9 and then to 10 again
but still the same error.

I have also run a disk check and there are no bad sectors. I am trying to
not have to reformat but I don't know what to do. Any Help is much
appreciated.