Severe Technical Malfunction

I am having fairly major technical problems
I have lost Internet explorer, all my music downloads and indeed all other documents.
Can't get into i-tunes or rip any CDs -so I am pretty much gubbed
Have also lost my @ function (having to cut and paste it!)

Looks like something pretty nasty has got into my system
Suspect I may be off air for a wee while until such times as I  (hopefully) get this resolved

Happy days