If you are running a PC/laptop with Windows Vista installed and it has NO services packs (also known as Windows Vista RTM or SP0), please use Windows Update to install the latest service pack available ASAP.
For security and stability reasons you SHOULD be on Windows Vista Service Pack 2 (SP2), please note you’ll need to install Service Pack 1 first.
I also recommend checking out Windows 7 as an upgrade.
On April 13th, 2010, Windows Vista RTM (SP0) will reach the end of support.
Marc Liron – Microsoft MVP