When I installed Avast Pro it continually scans the machine on boot; so much so that it does not allow Explorer.exe to load. On several reboots it then allows Explorer to load; therefore allowing the icons to display on the desktop. The same is the case with Avast Home. When I uninstall Avast there are no problems booting, but whenever it goes on it creates this issue.
Absolutely none. It was on a fresh install of WinXP Pro. Now, if I uninstall Avast the machine works fine as well; the same is the case if I were to re-install XP completely and not install Avast.