Ratandeep,
Thank you for the suggestion. Unfortunately I do not have the Windows 7 installation disk. I purchased a reconditioned Lenovo, sealed with instructions about the need to activate my "new, genuine copy of Microsoft Windows 7" already loaded. Since it had a Product Key, I did have to activate it, and the purchase was through a retailer I have dealt with over many years, I wasn't concerned.
Ideas about proceeding?