On my dell mini, I keep getting a pop up box from windows xp professional that says to enter both words below. I enter the words and a box comes up saying windows defend wrong catchup. I then got an error message bill108.exe. This stops me from going on the internet and stops the computer. Any ideas?1 person needs an answerI do too

On my dell mini, I keep getting a pop up box from windows xp professional that says to enter both words below. I enter the words and a box comes up saying windows defend wrong catchup. I then got an error message bill108.exe. This stops me from going on the internet and stops the computer. Any ideas? Unfortunately, bill108.exe is a malicious file. Your computer is infected.