Photoshop of Horrors

Can anyone explain why Photoshop 7.0, which has worked perfectly until now on my P.C., will load and open images, but will lock up when I try to use any menu bar functions? I cannot create new images or change image sizes, etc.

I don't even get an error message - it just stalls. Nada. Zippo. Zilch. Ugh.

I s'pose I could reinstall it - but that just seems DUMB!