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I would suggest you try safe mode.
Safe mode is a troubleshooting option for Windows that starts your computer in a limited state. Only the basic files and drivers necessary to run Windows are started. The words "Safe Mode" appear in the corners of the display to identify which Windows mode you are using. If an existing problem does not reappear when you start in safe mode, you can eliminate the default settings and basic device drivers as possible causes.
If you don't know the cause of the problem, you can use the process of elimination to help you find the problem. Try starting all of the programs you commonly use, including the programs in your Startup folder, one by one, to see if a program might be the cause of the problem.
Follow the steps to boot the computer in safe mode with networking:
1. Restart your computer if it is powered on.
2. Tap the F8 key after your computer initially powers on.
3. Once you see the Advanced Boot Options menu you can stop tapping.
4. Use the up/down arrow keys to highlight your selection.
5. Select Safe Mode with Networking and press Enter.
6. You should see drivers loading, and then please wait.
7. You should then be at the Welcome Screen.
8. Logon to your computer using an account with Administrator privileges.
I had a similar problem and I had to "Delete Volume" when in DIsk Management. I then had a choice to "Create Simple Volume" which I did, and then a wizard created the correct partitions and assigned a drive letter to my external drive. Everything was them OK.
It sounds like it could be either the battery is going bad and not holding a charge or the adapter is. I have had really good luck with similar problems going to places like Batteries +, and large electronic retailers, and my favorite the small local mom and pop computer store; where I end up asking them If I could try one of the adapters from the floor model to eliminate if is a faulty adapter. Other then that I'd if its not out of warranty contact Acers online chat support at http://us.acer.com/ac/en/US/content/service
Please download the ERD Winternal Image from http://www.mininova.org/tor/857048 and burn it in a CD. Thenboot your PC from the CD. Select your Windows Media Edition for whichyou have forgot password. Without asking for any password you will getinto Windows. Then goto control panel->User Accounts->Select theUsername[for which u want to change password]. Then use change passwordoption to change password. Then Reboot the PC and remove the CD. Nowyour windows password will be reset. Thanks.