Is this a virus or is my registary haywire?

Hello experts,
i think my computer has some kind of virus or its just the registary is haywire heres the problems i have been having for the past month:
-MSN messenger wont sign in plus when i type my address on it the letters respond very slowely and the error code is 80040154
- McAfee security center and windows has error while updateing (same error code as MSN)
-Cant open, create or delete MSN hotmail
-lots of McAfee icons appear on the toolbar (bottom left) and when i scroll over to them they dissapear
-MSN wont uninstall no matter what ive tried (yes ive tried RUN and COMMAND PROMPT on administrator and also tried in safe mode)
- on MSN connection options it says im not connected to .NET

BTW: I am useing a Acer aspire series X desktop computer with windows vista home edition SP2

conclusion: is it a virus or a registary problem or do i have to wipe everything off the hard drive and re-start?

Yours sincerly:
Wolf Warrior :)