Hi Daryll - I'm guessing the ATI Radion screen is just the BIOS screen after the reboot, which is normal. When just after this screen disapears, tap F8 on the keyboard and this should give you an option to go in SAFE MODE. Once in Windows (SafeMode), it might be worth try to perform a system restore. To do this click START, ALL PROGRMAS, ACCESORIES, SYSTEM TOOLS. This will restore the PC back to a time whereby everything was working well as It sounds like Windows had corrupt. Hope this is of some help.
You can do a system restore with the normal start up. No need to go into safe mode