You'll have to boot the DVD if Vista will not start on the new hardware, as is likely.
Restart, Enter BIOS setup by tapping Acer F2 key, set DVD drive to boot first followed by HD, or use the Acer one-time BIOS Boot Menu key F12 to trigger DVD at boot. When prompted to Press Any Key to Boot DVD, do so.
If you have files you want to copy out from Vista, use the DVD following these steps first: Copy & Paste - in Windows Recovery Console - Windows 7 Forums.URL
Next close Recovery console, select Install Now, Custom Install, use Drive Options to Delete partitions, create New as you wish, Format before install. Screenshots of each step here: Clean Install Windows 7 - Windows 7 Forums.URL
If you have the Upgrade version, the installer will scan the HD to see Vista at bootup, allowing use of Upgrade version key up front. If you wipe the HD first, you'll need the workaround given here to activate after install: Clean Install with a Upgrade Windows 7 Version - Windows 7 Forums.URL