I installed IE8 on XP SP3, after install reboot, it just flashed a full white screen then dies.
Manually removed IE8 back to IE6 and rebooted. Tried to install IE8 again but after install reboot, the same happened.
IE Tab in Firefox still works so that is my only choice for accessing ActiveX sites now....

I have not seen a solution. I was running the IE8 Beta just fine on this PC before upgrading tot he official release.