I’ve been working with a Microsoft Vista tech, but we can’t resolve the problem. Both PCs run Vista Home Premium and I built both using ASUS MBs, and AMD Athlon 64 CPUs. One has 2 Gigs or memory and the other 3 Gigs. Plenty of HD space and current sound and video components — using Windows Vista approved drivers. All other Vista updates install automatically and I use System Mechanic Pro to clean and Windows Live One Care to protect. On one PC, the SP1 download never shows and on the other, it won’t install. I’ve done a clean boot in prep for install, but the problem continues. The MS tech finally advised me to wait until next month when an updated SP-1 comes out. Do I really need SP-1?