I was trying to upgrade my Windows XP laptop to Window 7 Release Candidate while doing laundry. The dryer buzzed and like a true geek, I did not want to hold up my Windows 7 upgrade for any reason. I took the laptop with me on battery power with the intention of answering any installation prompts while I hung up my clothes.
Unfortunately, after it copied all its temporary files over to the hard disk, the Windows 7 installation informed me that it could not install while on battery power. The only option was to go back on on A/C and start the upgrade over.
So much for saving time on the upgrade. I had similar experiences when I try to save money too ... Apparently I am not that good at either sometimes ...
Hope that helps
Microsoft MVP VB