I took the hard drive out, put it on an another PC and installed windows 7. At the same time, I took all the other parts from the old pc, cleaned, and also reset BIOS.
After the installation finished, I remove the Hard disk and installed back on my old pc and booted it. But the problem is now that Boot manager doesn't recognize the windows 7 which i installed earlier. How can I solve this problem? May anybody help me? Thanks in advance.