reformat your hard drive worth a try but i had to buy a new hard drive because my isp said my pc was sending out spam so i already tired reformating it n i think it worked but i had used a key gen so tht teached me but i used my old hard drive now as a usb external hard drive, mine was that i used a key gen, never use 1 of them again the pop ups gave me **** n slow down on my pc.
A reformat should do it!!!