Vista (install and UAC) problems

• On installation: Windows could not determine if this computer contains a valid system volume This can occur if you have a USB drive in your machine on installation - see here for details.
• Turn off Windows needs your permission to continue (known as UAC) - Basically it can be done in a variety of ways (see this handy blog) - like using the user account control panel, msconfig or TweakUAC.