Most likely your video card drivers need to be updated from the card makers site (not through windows update).
In photoshop if you go to Edit>Preferences>Performance and uncheck Use Graphics Processor and then restart photoshop, does that make any difference?
What operating system are you using?
This is a known problem in Win 8 with some video card drivers.
yeah i'm using win8 with a radeon HD 8550
win8 i'll try that! thank you