I need help desperately

I use photoshop 7.0 for a while now but today it just won´t open. It stars to load but instead of really opening it just disappears.
I tried to restart my comp, uninstall photoshop and reinstalling it again but nothing seems to work.

EDIT : now that message is showing up...sometimes it shows up but most of times it doesn´t


I really need your help...please if you have any ideas let me know.