Counterfeiting Windows XP Home Edition

Last saturday night I open my tree accounts yahoo mail, gmail, ym,
To check.
While surfing in the internet.
I open my control panel to remove any necessary programs in my computer.
But I check the box above show update and I check it. I restart my computers to take
Affect the program that I remove in control panel.
After I restart my pc this messages show
Victim of software counterfeiting windows xp
What is this?
Please help me for some assistance about this

