in theory, when u upgraded to 7 you should have made a system restore. If so, then you can go back to the system restore and everything will be normal...
If not, then you need to back up all your data and reinstall Vista
As much as I like Vista, I don't think I'll ever see the need to go back to it once Windows 7 is installed. However, it should be possible as long as you retain the Vista OEM product key and media.
------------------------------Desktop: Windows 7 Professional 64-bit; Intel Q6600 CPU; E-VGA 780i SLI motherboard; E-VGA E-GeForce 8800GT; OCZ Vista 4GB dual-channel kit; Ultra X2 750W power supply; 2 x Seagate Barracuda 7200.11 500GB in RAID 0. Laptop: Acer Aspire 8730-6314;
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