Macbook Pro not saving files

I have a macbookpro with snow leopard and it does not allow me to save anything on one account. At first I can save things like screenshots but after a few minutes i get message "your screenshot can't be saved" for screenshots or "the document can't be exported" for documents i want to save to my downloads folder. I already repaired disk using disk utility but i still have the issue. is there anything else i can do

Try booting with your Snow Leopard DVD and use Disk Utility to do a permission repair. Or you can download the free utility OnyX and repair permissions from there.

If that doesn't fix it, post back and we'll see about trying something else.

snow leopard utility

I already repaired permissions on snow leopard cd and it didnt fix it

does anybody have any further suggestions?