okay.. so i just "bought" photosho cs4.. had the same problem with cs3, my friend did not..
when i move pictures and such it kinda glitches.. if the picture is 1000x1000 it loads 300x300 of the picture every 0.05.. well its slow.. its like the computer has a bad graphics card and you're moving a mapp really fast on the desk.. but it cant be my system that causing this?

sapphire radeon hd4870 1GB GDDR5
750GBHDD
P5N-D
3.33GHz intel duo 2 core

ive tried to look up why this is.. and i have no effing idea x.x.. please.. pimp my photoshop :o