It might be a good idea to ask in advance next time rather than just trying things in the hopes they'll work out. There is a very specific way this is done. We normally ask for a screenshot to see if there are unknown hurdles such as Logical partitions in the mix, but you're unable to do that now so try this:
Mark the Win7 partition Active, then boot into the Win7 DVD System Recovery Options
to run Startup Repair up to 3 separate times to write the System boot files to Win7 partition until it starts. Partition - Mark as Active (Method Two)
Once Win7 starts post back the screenshot of maxmized Disk management drive map with listings, using the Snipping Tool in Start Menu. We'll give you the steps to remove Vista and recover its space into Win7 - which can under correct conditions be done neatly all at once following these steps: Partition Recover Space Used by an Older OS
If recovery fails, boot into free Partition Wizard
bootable CD to post back a camera snap of your full drive map with listings.