Thanks again, BR
I just uninstalled, restarted my PC and tried to install Calibre x64 but I get the message that setup wasn't able to complete

Tried installing x32 version but no luck.
Any ideas? I uninstalled a bunch of stuff yesterday, like ghostscript, etc.. But I'm not sure if that has to do with these errors..
ps: If I decide to do a fresh OS install, 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?
Thanks again for helping me out, guys.. Greatly appreciate it.