Excel xp

Tech-Archive recommends: Fix windows errors by optimizing your registry

Everytime I try to save changes in an Excel xp file, I get this message:
The file ___ may have been changed by another user since you last saved it.
In that case, what do you want to do? -save a copy, or -overwrite changes

I have been -overwriting changes. No one else on the office network has
this problem - just me. I've also had problems with Publisher xp.
.

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