Warning: Dangerous spyware

[IMLOST]

I have the above permanently displayed on my desktop with no control over changing the appearance. I suddenly have offers for Antivirus XP pro. "My Documents" appears out on nowhere. I am told that the administrator has disabled the Task Manager. My computer locks up and I have to shut it off at the computer.
I have downloaded McAffee, with no change. Help, please!

 

[kimsland]

Uninstall your McAfee Antivirus
Then run the McAfee Removal Tool

Install Avira free AntiVirus


Then have a look at:

UPDATED 8-step Viruses/Spyware/Malware Preliminary Removal Instructions