If you have a manufacturer's recovery system (DVDs from HP, Dell, etc), it will likely format itself...just point and click. On the other hand, if it's a standard Vista DVD I would suggest, when reaching the part where it asks you where to install Vista to, deleting the existing partition and then creating a new one, installing Vista there. (Partitions are logical divisions of a hard drive. Even if you only have one partition the size of the entire hard drive you must have one in order to use the space.)
Hope this helps,
My computer keeps freezing and after looking at it my friend said i should just reinstall windows b/c its probably a software issue or has spyware - So i have 2 question-
1- Do I need to wipe out everything first or can i just reinstall windows
2- Whats this partition thing - all i want to do is reinstall winodws - what should i do when i get to the part where it askes me where i want to install windows?