Hello,
I just started to have a problem after installing Kingston. 
I just installed several new VSTs and confirmed they do reside in the correct VST folder (where previously scanned and working VSTs are).
Sonar is not picking them up, even if I do a manual scan.
Something is wrong here, any help would be appreciated.
Thank You!

Reboot.  Then be sure to RESET first, then rescan.
 
If still a problem, uninstall the VSTs, reinstall, then do all of the above.

can anyone tell me why is it, when i start music creator 6 i get a message that says cannot open Master.INS?

This should be its own thread in the Music Creator area
Please post questions about MC there.
 
Try holding the SHIFT key when starting MC6.