I have a red circle with whiteXthatappears atbottom ofscreen&sayscomputorinfectedwhatshouldIdo?

Answer 1

you need to download superantispyware http://www.snapfiles.com/get/SuperAntiSpyware.html

Answer 2

You have spyware on the computer. Get SpyBot Search & Destroy to safely remove spyware. Best of all, it’s free. After installing it, immunize the computer against over 16,000 known pieces of spyware. Then run a full bot check and remove everything it finds using the Fix Selected Problems tab. Keep it updated and run it weekly to keep your computer free of this stuff. I’ve used it for 3+ years and depend on it to find the stuff that hides in your computer and causes major problems.
http://www.safer-networking.org/