bad checksum for starters......

it all started when i tried to start up my full tilt poker, it wouldnt let me for a full day and then i finally IM'd someone who plays there to ask them if the site was down and it wasnt! So i went to uninstall the program and my computer tells me i must be admin to do so....then i went to email full tilt and the security alert window keeps popping up whatever i do...so i get my restore disc out and proceed to restore my computer back to when it was new.......once it was done i started my computer and it beeped twice and a black screen with white lettering came up and at the bottom is where it said bad checksum and to hit f1 to start windows...i did that and it took me through a set up for a new computer and everything, but once i got to desktop it had all the shortcuts for a new computer plus it had some of my old shortcuts too...including full tilt poker!.........im able to go to websites but not without the windows security alert window popping up constantly....i havnt visited this site in a few years and could not remember my username and password so i put in my email addy and it never sent anything to it....so i made a new acct. with different email addy to get this message out....if anyone can help please do so ty for your time....