Photoshop CS2 weird problem...toooo slow

My laptop runs on a 1.8 GHZ Centrino with 1 GB memory and 80GB hd.
All my other applications run perfectly …including ImageReady CS2 but
Photoshop CS2 is driving me crazy, i mean i click on something (a tool from the toolbar for example) and to switch to something else or just to try to go to File>Menu ect toolbar i have to wait for 10-20 secs.That happen on everything i do within Photoshop.It dosent happen on ImageReady though.

Any idea ?..I tryed re-install but it didnt got solved.