Photoshop bug or Windows bug

Whenever I print my DVD case label for my program in photoshop (very high res image) my computer slows down to a crawl even ater closing photoshop and a reboot is the only way out but I only reboot every 2-4 weeks.

I know some people say its a windows bug, this this only happens with photoshop, no other memory intensive program or game causes my computer to run like it's 1mhz after using it other than photoshop.

I know Acrobar from the same maker is unbeleivably buggy, so this leads me to think it's a photoshop bug.

I have Windows XP by the way (how else would I have Windows and not reboot for 2-4 weeks, unless I had 2000 which is about as stable if not more).

Thanks