End-of-file on ALL files while trying to save

Hey everyone

I have had CS5 for many years, recently and unexpectedly, every time I try and save any file, it results in the 'unexpected end-of-file was encountered' error. My actions look like this:

1     Open Tiff file from finder using photoshop application

2     Save-as png or jpg file

3     end-of-file error

I uninstalled PS, and reinstalled, yet the error persists. Every image file I open runs into the same error, it doesn't mater if I try to manipulate the file, or just save it as a different file type (jpg/tiff/png/ps). Every, single, file, results in the same error.

Help

Update: apparently saving the file for web and device 'save for web & device' works, but regular 'save-as' does not...