nah, not formatting shouldn't hurt your mobo in anyway.
Also, not a lot of people know this, but the only difference between a quick format and normal format is the 'check disk' function that checks the HD for errors. Generally if your HD isn't acting up in any way a quick format is just fine.
However, if you had your computer for a while and it got fairly cluttered and you hadn't formatted in god knows how long then yes perhaps a normal format is more instore but I wouldn't think that'd be causing you these issues.
Instead of using those old drivers, you should check ATI's website and get the most up-to-date drivers.
Can't guarantee you either of those will fix your problem though. It's one of those where I need to be there to really help out.