Windows 7 is 64Bit needs 20Gigs, but still on target. Got Vertex2.
Move your My Doc folder files away from system drive. In case u will do,
Move Your Libraries
This is a critical step in the way I set up computers. A problem free backup / restore process depends on you having your docs, music, pics, etc. on a drive or partition other than the one Windows 7 is on. Using this method you do not have to worry that some issue (virus, crash, hardware failure, etc) will mean losing your data.
How To Move Windows 7 Libraries
Decide where you want to move these to.
A second disk is your best option but in a single disk system a second partition will do.
Right-click on your User Name in the Start Menu and choose Open.
Select the libraries you wish to move and copy / paste them to the new location.
Pick the stuff you wish to be safe from any problems.
I would do at least: Contacts, Downloads, My Documents, My Music, My Pictures, My Videos.
http://www.tweakhound.com/windows7/install7.html