Service Pack 1 will start downloading to PCs automatically beginning in mid-April.

If you want to get the benefit of a year's worth of improvements right now, click the Start Menu, All Programs, and select Windows Update.

Download Windows Vista Service Pack 1:  http://www.microsoft.com/downloads/details.aspx?FamilyId=B0C7136D-5EBB-413B-89C9-CB3D06D12674&displaylang=en