sounds like it's now dual booting if you can run both operating systems.
personally, i'd back all your personal data up and then do a clean install. at the w7 install screen, select 'advanced' features and delete ALL the partitions and then it will be starting from scratch.
bear in mind, if the original recovery partition is on the hard disk (instead of disks you may have got with it) you'll lose that too. Also, as it's a laptop, you might need to find a few drivers afterwards.
As a rule, w7 should atleast aswell as Vista, usually much better.
EDIT - when i say backup -= OFF the laptop completely, onto a USB hard drive or burnt onto DVD's. This will be your data though, not installed programs.