How is compatibility different with Windows Vista Service Pack 1 (SP1)?
Released in February 2008, Windows Vista Service Pack 1 (SP1) includes the complete set of Windows Vista updates we’ve issued over the past year. Available at no charge, Windows Vista SP1 doesn’t add features or require you to learn anything new—it simply makes your PC even more enjoyable to use and helps it run more reliably and smoothly.In addition, our hardware and software partners have worked extensively with us to help improve the Windows Vista experience. They’ve updated more applications to be compatible with Windows Vista, delivered new device drivers, and ensured that most new devices and software programs are compatible with Windows Vista.