Good evening hellomotto09 and welcome back
Sorry on the delay
The only way you will be able to fix this is just what I had posted and Allan had said the same thing. Once you make that big of hardware change. Windows needs to be reinstalled, but I do see in your other post that you don't have the W7 disk but you have the key / coa.
If you know of someone that has the same version of windows and same bit version ask them if you can borrow it. So lets say you installed Windows 7 Home premium 64 bit than that is the version that you would need to borrow and just use you cd key /coa.
Hope this helps you if you have any questions please just let us know. Hope to hear from you soon. Mike