photoshop crashing/freezing

hi, I have windows 7 professional and I primarily use photoshop for digital painting.

I'm experiencing this freezing or crashing every 5-15 minutes, where I'm working and all of a sudden, this window will shrink to someplace off screen, like in a flash, and then photoshop will be unresponsive. When I start up my task manager to force photoshop to close it'll say that it's waiting from a response from me. I never see any dialogue box and am forced to end program. I've checked out all of the updates on windows and redownloaded this program 3 times now and I still can't figure out what's wrong. I've even gotten on the phone with microsoft and they tried to remotely see if they could fix it. Does anyone have a solution?

Sincerely,

Megan