This is probably for Dummy mostly but anyone else wnats to chime in then go for it.
My new edu dept. laptop (3 weeks old) isn't charging off the AC. It's a HP Probook. I get the message "battery at 95% plugged in not charging" when I mouse over the icon in the tray.
Searching the net finds that this is a common problem with Win7 on laptops of all makes and models and this is the supposed fix which can be found on many, many sites and youtubes:
Under the Batteries category, right-click all of the Microsoft ACPI Compliant Control Method Battery listings, and select Uninstall (itís ok if you only have 1).
So, I've done that, multiple times, and it hasn't had any impact on the issue.
I've also just removed the battery while booted up, deleted the battery controllers as described above, and reinserted the battery and run 'hardware changes' search which was also suggested on various forums, all to no avail.
Meanwhile the laptop continues to run just fine off the AC but if I ever start to run down the battery, its not recovering the charge when I plug it back in again. I colour stuff...