Another pretty save and easy to use program is Deep Freeze.
You can freeze your Windows partition and as soon as you reboot, your pc will go to the state you made when you "freeze" it.
This way no viruses,keyloger,trojans,rats and etc can infect you (as soon as you reboot, the bad staff is gone).
Downside is that you will have to put the block-chain of any coins you use on the second partition of your harddrive (because you will not be able to update the wallet on the windows partition).