[SOLVED] Reinstall Vista from Windows 7 RC

I want to reinstall Vista on my PC. Can i reinstall from a second partition on my primary drive running Windows 7 RC? I'm reluctant to try without advice as my DVD drive isn't working at the minute, (that'll probably be my next thread lol) and if i mess the bootloader up i won't be able to even boot from DVD. I intend to reinstall Vista via a USB flash drive from Windows 7. This is how disk managemt looks incase you need to see