Since your Vista Recovery Partition will be disabled with the removal of Vista, make your Vista Recovery disks first if you want a path back to factory condition. These can also be ordered from tech support later if neccessary, or you can find a Vista installer for your version to activate with the key on sticker if you ever need to clean reinstall Vista.
Back up your files as Resizing operations can fail, although very rarely with Partition Wizard.
Boot into free Partition Wizard bootable CD
, allow files to load, select 1 for Screen Resolution, right click Recovery partition, select Delete, OK.
Next right click Vista partition>Delete>OK.
Now right click Win7 partition>Modify>Set to Active>OK. Again right click Win7>Resize, slide left grey border all the way over to the left to include deleted Recov and Vista space, OK. Apply all steps.
After steps complete, Win7 will not boot. Instead boot into Win7 DVD or Repair CD, click through to Recovery Tools list to run Startup Repair up to 3 separate times with reboots, as it will attempt to repair and finally rewrite System MBR to start it up.