Interesting, perhaps that driver is faulty. Report it to AMD and in the mean time, try an older version to see if the error goes away. Odds are you would need to do a complete uninstall of the driver before you can use an older version.
Also keep checking this forum to see if others are having the same issue.
@all other amd 7800 video card users:
If you are not having any issues with your driver, please post here with your driver version number so this person knows if it is the driver or another issue.
Thank you...