Windows 7 Troubleshooting? Help Please?

So, let me get this straight... you did a ram and hard drive upgrade. This is and entirely new hard drive that you purchased? The only thing i can think of would be to check your ram and make sure its installed properly, and comparable. Verify that your processor will support the 64 bit processing. I'm a little unclear. Are you duel booting your operating systems? If that's the case, wipe out that drive and reinstall just your 64 bit copy. On the other hand, do you have two hard drives hooked up with an os on each one? That could cause problems too... hope this helps, good luck!