I have attempted to install this upgrade about 20 times over the last 6 months or so. :( Everytime I have the same problem. It takes about 30 minutes for the install, then when I restart the computer to complete the installation I get a continuous reboot situation. The Microsoft site discusses a UMAX scanner driver which causes this problem. I do not believe I have this driver as I have a HP psc 2510 all-in-one and I cannot determine that it uses the UMAX driver.
I contacted the manufacturer of the computer and they gave me no help. All they said was SP2 was too buggy and they recommended agaist the installation. I am afraid I will miss some critical upgrades if I do not install this.