Hello Peter,
Once I was in yesterday, it was quite unstable even after the SURT return no errors. I proceeded to backup my files and formatted the drive.
Went back to Win 7 again x64 (Clean install) this time but the system was still unstable and even getting stuck on loading screen.
As I am typing this, am running windows update on Win10 x64 (Another clean install) and for whatever reason, the system is *currently* smooth. Will be updating drivers and see if there is any sign of a bad disk or sudden drop in performance.
Thanks for the help but I lost the battle with the win7. Will keep you updated if something manifest on this OS but unsure if it would fall under my initial reason I came here.