My Desktop is Striped w/Frame Superimposed. Am I infected?
Hello all, my computer is a Dell Optiplex GX 270, Microsoft Windows XP Professional Version 2002 Service pack 3, 2.8GHz, 512MB of RAM. (Not the 64 bit), Internet Explorer 8.
Earlier this week what I see on my computer desktop screen underwent a change. When I turned on the computer previously I saw all the little tiles of the different programs on a bluish background. Now what I see are three horizontal bands the top aqua, the middle black, and the bottom white in the size ratio of approximately 2 aqua: 4 black: 1 white. Superimposed on those bands, taking up almost all of the screen is a white frame whose center is all black. The program tiles and everything that was on my desktop is now in that center black that is in the white frame.
Even though Microsoft is not supporting Windows XP they keep sending updates and I download them.
My computer does seem to be running slower.
Another problem I have noted is that I cannot put up new threads on a professional blog that other people are still able to.
What I have done so far to remedy the problem that has not worked:
Cleared the cache.
Done several system restores.
Emptied the recycle bin.
Run Malwarebytes Anti-malware in regular mode and in safe start mode (nothing detected)
Avast anti-virus runs all the time.
Am I infected?
Is it another problem?
Thank you in advance for your help and advice, please speak and advise simply, I am a computer dummy.