@Vishal Kumar Singh
Welcome to MT.
You already have decent security configuration.
At the most extreme for Windows you can harden Windows OS, add Software Restriction Policy and Anti-Executable software, and finally, light virtualization software.
The most extreme would be to migrate to Linux - but I don't think that is what you wish from your post.
Hardening the OS involves researching tweaks and disabling features in W7 that are never used.
Software Restriction Policy software include Blue Ridge Network AppGuard, Excubits Bouncer and NoVirusThanks Smart Object Blocker.
Anti-Executable software includes NoVirusThanks Exe Radar Pro, VooDooShield and Faronics Anti-Executable.
Light virtualization software includes Sandboxie and Shadow Defender.
My signature shows a popular configuration amongst some security soft geeks.
Notice I have no AV suite installed - don't need it.
I don't bother hardening the OS except for a few tweaks - such as disable remote assistance.