Sandboxie

[Ashwin]

but ashwin Sandboxie is also not free

Let me guess, you havent used Sandboxie before?

Sandboxie has a free version. Download it, just about 1.5 mb. Tiny file, incredible protection.
There is an option to buy the pro version if you want. Their website does not mention a free version, but this will:

http://www.filehippo.com/download_sandboxie/

Geswall too has a free version, 30 day trial for pro available. Once the trial period ends, it reverts to the free version.
6.4mb file, download

http://www.gentlesecurity.com/desktop.html

[Grr]

Let me guess, you havent used Sandboxie before?

Yes, u r right. But I will use the free version link given by you & install, try it.

Thanks Ashwin.