Did you recently remove adware? It sounds like you may have a rootkit.
I only installed AVG 2011 Free Download.....it removed AVG Free 9, then all hell broke loose. Is AVG 'adware', and what is 'rootkit'....I am a senior and still learning all these words?
Last night I managed to install Norton 360 .4 after many screens of instructions and screens freezing this morning, but have just switched on and all seems to be running ok with Norton.
The Computer Club I go to, have now advised us not to install AVG 2011 until they find out more about it, as other members have been having trouble with their computers too!
Thanks for your reply, most appreciated,