I Have searched for the solution of this problem and I Found this working...

So,

Following Are the step to over come the problem: Plugged in, not charging on  Windows 7

1. Disconnect AC
2. Shutdown
3. Remove battery
4. Connect AC
5. Startup
6. Go to Device Manager
7. Under the Batteries category, right-click all of the Microsoft ACPI Compliant Control Method Battery listings, and select Uninstall (it’s ok if you only have 1).
8. Shutdown
9. Disconnect AC
10. Insert battery
11. Connect AC
12. Startup

Note: Try this at your own Risk.