Windows 7: PC freezes at login, have tried flashing CMOS

I installed a new motherboard, ram and graphics card yesterday. Installed all the drivers and everything was working fine. Got up today turned pc on freezes just after I enter my login password (i had not touched with the PC in between). I run it in safe mode, runs for 2-5 minutes then freezes. I flashed the CMOS to see if resetting the bios would work, it works to let me log in and then 2 mins later freezes just the same. Hard restart after this then turn the PC back on freezes at the login screen again. It has on occasion frozen before the login screen, ie when it shows the motherboard company logo. Any help would be useful cos im stumped?!
PC info:
CPU- AMD Phenom II X4
Mobo- MSI 880GMA-E35
GPU- Powercolor HD7870
RAM- Kingston ddr3 1600 4GB x2
HDD- Barracuda Segate 3TB
SSD- Intel 120GB (with os on)

Did you reinstall Windows after the hardware change? If not, see if Method One is this tutorial can get things straight for you. Windows 7 Installation - Transfer to a New Computer

Yeah windows was re installed and activated. Is there anything ese it could be?

If you can get in to make a screenshot of the Disk Management, that might help. Screenshots and Files - Upload and Post in Seven Forums Be sure and expand the columns so we can read all of the print.