|Your current MB is an mATX form factor. The new MB is a full ATX form factor, which is larger. Will your case hold a full size ATX motherboard?|
The specs are so different you will need to perform a repair installation right off. The new board will probably stop Windows 7 from booting at all.
Something else to watch out for. Before pulling the old board out, boot into the BIOS screens and verify how the drives are configured. There may be 3 different ways which are:
1. IDE compatibility mode
The preferred setting is AHCI.
You may need to set the BIOS in the new board the same way. I am not sure if you set it differently that the repair install will work. It may.
I hope someone else here that knows that answer for sure posts a reply.
You may also need to re-register Windows.
You did not specify what else you are installing. A new graphics card may require a more powerful power supply.
If you supply the remaining hardware specs we can evaluate them too.
Are you using a case from an OEM computer?