Ok
uninstalling drivers .Take a trip to control panel and click add and remove programs
.locate your drivers in add and remove programs as well as the ATI catalyst center
.click uninstall or remove
.then reboot when prompt
.Then travel to the last link i gave you and install all of 2 programs which are (ATI catalyst and your display drivers)
.Then you will need to reboot again
Plan B (SAME AS ABOVE BUT DIFFERENT METHOD)
.Right click my computer and click mange computer management should come up
.Now on the left hand side you will see a device manger part of the list click it
.Now you will see a whole bunch of icons click display adapters (Expand the +)
.Now you will see your graphics card double left click it
.you device properties will come up and you will notice some tabs above
.click drivers
.click uninstall at the very bottom
.success you have removed your drivers
Again travel to the last link i posted it has your latest radeon drivers , if this fails i suggest taking your card and get it looked at by a pro theres not much i can do from here as i cant see it but it really seems like its overheating.
Gluck let me know how this works out
Tony
Also take this into consideration im not to sure how long this has been doing this before , but like i said overheating isn't a good thing at all , its best you do remove your graphics card asap and get a replacement in case it fully burns out .....