Hi there Paresh, long time no see! How's it going my friend?
I'm running Windows 7 (64bit) here, so if you remind me which version of Guitar Tracks Pro you're using, I'll install it on my system for you to see if it runs straight out the box, or in compatibility mode, or not at all (I still have my installation discs for GTPro2 and GTPro3).
If you need to upgrade or are just thinking about it, maybe check out Cakewalk's excellent X1 range
HERE; the entry level version of this current software is
SONAR X1 Essentials - check it out
HERE.
Just remember if you do decide to upgrade at any time, all the SONAR software can be downloaded direct from the Cakewalk Store -
HERE - and providing you've got your version of GTPro registered, you will get a decent discount as a registered user, in some cases a lot cheaper than the 'normal' price. If you haven't already registered GTPro, it's not too late, just create an Account
HERE and then follow the links to Register New Gear.
In any case, let me know which version of GT you're running first and I'll test that out for you.