When manually removing a rather nasty virus I accidently deleted the
rundll32.exe file. Although I think it should be simple to restore, I can't
for the life of me figure out how to do it!? Can someone help?

i have a compaq presario 7478 pc i am not sure what took place but i got up 2
days ago and my pc had problems i seem to have lost just about everything
including my scandisk and diskdefragmenter.  i have tried to restore my pc
with no success i have gone into safe mode and tried ...

I don't use my computer often.  When I tried to defrag and scan disk I keep
getting messge tried to start 10 times are there other programs working.  I
don't know how to check programs running in the background.  Can anyone help
with this issue?