​coreldraw corrupt file repair

hi! I have an annoying problem when I save files in Corel Draw 9.
The problem is that many a times I save a file, I cannot reopen either the original as well the backup file. I get a message - error reading .cdr file.
what i have to do?

I was working in CorelDraw 9 about 4 to 5 years. You should reinstall your Win, it’s because of some errors between your Win and CorelDraw.