Have you tried an older version of CGminer??
First try it out. I am using 3.1.0
Also if you are going to re-install windows then don't download the latest drivers. 13.1 works well.
Actually in home i have Radeon 6450 which is a really bad card and i can't run because it not detecting my gpu even i have tried old 3.1.0 version so i will try tomorrow on my office pc there a good card is available then i will upate here.
Hi saif bro thanks as i said above still no luck i sure it is due to my bad card i will run it on my office PC
I am sure it is not the problem with your card. It must be corrupt Windows or bad driver. Or the PCI port may be faulty.