I'm running XP64, SP2. I've downloaded and installed ie7 & ie8; neither will load even though the installations went smoothly. Generally, I use firefox. But there is an application that requires IE. The IE add-on to firefox doesn't help. [similarly for Chrome] Anti-virus is turned off. Both versions of iexplore.exe [32 & 64 bit] are in their IE directories. Neither the 32 bit or 64 bit versions load. Hotfix did not help.