Photoshop won't open certain files

When I try to open some files in Photoshop it brings up the error "cannot complete your request due to program error". The weird thing is it opens some .ps files, but not others. And any new project I create save and open fine. It seems to be older files at won't open.

I googled the problem, couldn't find anything, and re-installed Photoshop, but it didn't fix it. I'm running CS3 on Windows Vista.

Thanks

 

They wouldn't open in Illustrator, but I loaded them on my laptops Photoshop and resaved them. Now they're opening fine when I bring em back to my desktop. I don't really understand why but it worked.

Fred, you are the man. Thanks!

 

This is what I've found out after more googling...

There seems to be a common problem with installing Adobe suite on Vista. I guess re-installing (like I've done twice now) leaves behind a bunch of ghost files in the registry that conflict with the new files and cause errors. Apparently its especially troublesome with Illustrator. They say you have to uninstall, then open up the registry and find ALL instances of adobe photoshop/illustrator etc. and delete them before re-installing.

I don't really trust myself with this whole registry thing, and I got a feeling if I start deleting things in it I'll end up making it worse. I won't bother with now, but if more problems pop up I'll try it and let you know if it works.