Hi Jinesh and Welcome to SCF Community!
We are here to help you and will do our best to resolve this problem.
To fix this right we will need more information's from your system provided by some special tools.
You will need to follow this steps and provide us asked information's:
First of all, download HijackThis:
http://scforum.info/index.php/topic,785.0.html after that install them to your PC and run. When you run it you will have option to save log file. Provide us that log (just simple copy - paste).
After that we will have a loot of helpfully information from your PC about that problem.
It's important to before running HJT turn of all possible programs.I'll be here and wait your answer (HJT log).
Don't worry We will fix this.
Samker