Thanks Mcafee and Jersysman!
Yeah, I'm leaning towards a reinstall
Sorry to keep pestering and this would be my last question:
Once I successfully reinstall Win 7, should I copy those 2 folders (C:\Users\Selva\Documents\Calibre Library and C:\Users\Selva\AppData\Roaming\calibre) from my backup, before beginning to install Calibre? Or can I move them once Calibre is installed?
If not, could you guys please advise what would be the right way to get Calibre up and running with my existing book collection (once the reinstall is done)..
Thanks a ton everyone for your time..