Once every few months, Windows 7 decides that it doesn’t want to charge my laptop while it is plugged in. Initially I thought something must be wrong my machine. A quick google search for “plugged in not charging” revealed that this is a problem with Windows Vista and 7 and happens to almost any laptop of all makes and models and the fix involves Uninstalling the “Microsoft ACPI-Compliant Control Method Battery” from Device manager and rebooting to reinstall it.