In case I install Windows7 RC in dual boot with Vista, at the end will I be able to remove it without affecting Vista? And how to? Thank you.

See http://social.technet.microsoft.com/Forums/en/w7itproinstall/thread/698e8576-86e7-4f28-855b-44ba5e4a12c3.Mob. AMD64 3000+, 1 G RAM, Mob. ATIRadeon9700, 20x DVDRW, C:XPSP3 (55G),D:WIN7 (25G),F:DATA (250G)

To uninstall: transfer all your files from the RC's partition to Vista's. Boot into Vista, go into Disk Management again, right-click Win7's volume, choose Delete Volume. If you shrunk a partition during install, right-click on it and choose Extend Volume to regain the space again. All that's left is an orphan boot entry. Easiest way to get rid of it is to download a program like EasyBCD to remove the entry.