I think someone is tring ot hack into my computer!!! HELP!?

I used my computer yesterday and since then I have been getting CONSTANT pop ups and "warnings", some that look authentic and some that are clearly advertisements for anti-spyware software. I even got a message saying that somebody already did or is tring to access my pc from a remote pc. I don't know what to do! I downloaded the 90 day free trial of McAfee, but even after I scaned and cleaned my computer it keeps saying it's infected with spyware and all this junk. ALSO! My background on my comp says WARNING! YOUR COMPUTER IS INTEFTED, BLAH, BLAH, BLAH. I can't change the background now. Please help me! I don't know how to fix it!

I think someone is tring ot hack into my computer!!! HELP!?hijack this

I have bitdefender. But if you have no clue about computers other than navigating on the net, take it to someone who can download the software for you and who will make sure that your computer is ok. Otherwise, someone may get access to your credit cards, etc. when you purchase online. Good luck!

I think someone is tring ot hack into my computer!!! HELP!?liveupdate

does it have a red quarantine sign on it too

also do you have security bar 10.0 or something like that on your Internet