i suggest you do whole procedure with exporting your own
drivers from vista
i have fujitsu-siemens P4 laptop so there can by something a bit changed in
drivers its exported after instalation
btw you can install vista without reinstalling windows 7
you need around 30-25 gb free space maybe less
-Control Panel > Administrative tools > Computer Management > Disk Management
-*than right click on your partiton and choose "Shrink Volume" with this method you can make current partiton smaller
-create new partiton in freed space atleast 15gb partition
-mount vista iso or enter vista cd
-start installation process from your windows7 not after reboot
-install vista on new partition
-export
driver with drivermax and restart
-import
driver with drivermax in windows 7
-Control Panel > Administrative tools > Computer Management > Disk Management
-delete vista partition with "Delete Volume"
-and at last make your Windows 7 partion to full size with "Extend Volume"
* you have to disable paging file and system backup during this process
if you have 25 gigs free but cannot shrink around 15gb it will need defrag your drive
after this procedure you can enable paging and backup again
maybe it seems scary but its realy easy
EDIT: i have 7000 too