I continue to have two error boxes that continue to pop up on my computer the message is " Runtime error 21 at 020149D2" And everytime i click "ok" or "X" out of the boxes my screen goes blank...

I have some sort of virus or trojan on my laptop. and it will not let me access anti spyware or anti virus sites on the internet to try and remove the spyware. ALthough occasionaly i can access a...