windows 7 non genuine issue

OK - we need to run the removal tools for Avira and Kaspersky, then

Kaspersky - Removal tool for Kaspersky Lab products
Avira only seems to have a registry cleanup tool - Avira Download Center | Download Antivirus for Windows

Reboot manually after running each program even if the program did its own reboot.
at the end, open an Elevated Command Prompt, and run the following command

NETSH WINSOCK RESET

it will ask for a reboot - do that, and then test validation again

i see that my windows is activated but only for sometime..after sometime activation status is not available and same problem as before..

Please explain in more detail.
Does the site say that you are genuine or not?
WHEN does it turn non-genuine again?

I can only conclude that you have some form of malware embedded in the system - or that something you've deliberately installed is breaking activation. Such programs include registry cleaners and system tweakers, and occasionally system protection programs that were installed at the wrong time (TeaTimer from Spybot is a classic example of the latter)

I think I'd better point you at the malware forums and see if they can help you there - my malware skills aren't what they used to be.
System Security - Windows 7 Help Forums
Virus, Trojan, Spyware, and Malware Removal Logs Forum - BleepingComputer.com
Malware Removal - HijackThis Logs - Malwarebytes Forum

make sure that your read and follow the forum guidelines on what to post and how! many malware forums will lock or delete new threads that don't follow their guidelines.