Not accepting password

Okay. You have to reset your router for factory default. The reset button may be located on back side or bottom side of your router.
Power on the router and insert a needle through the reset hole for 10 seconds for reset your router. Give new password.

Before you do this, keep in mind that your Internet connection's User name and password.

Reset the D-Link to default settings. Repeat the process.

Hello you might have to reset it and set it up again.

TWG850-4U Default IP: 192.168.0.1

TWG850-4U Default Password: admin
TWG850-4U Default Username:blank

Here is a guide:

http://compnetworking.about.com/od/homenetworking/ht/routerconfigure.htm

Good luck

Procedure 2.3 - Accessing the User Parameter Program
This procedure allows you to change the following settings:

• Set Measurement Units
• Enable/Disable Password
• Set User Name

Procedure

1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Press keys STOP,5,6,7,1 sequentially.
3. The display will momentarily read SELECT UNITS
4. The currently selected measurement unit will then be displayed.
5. Use the UP, DOWN arrow keys to toggle between U.S. STANDARD and METRIC.
6. Press the ENTER key to select the currently displayed measurement unit.
7. The display will momentarily read, PASSWORD
8. Use the UP, DOWN arrow keys to select either PASSWORD ENABLED or PASSWORD DISABLED
9. Press the STOP or ENTER key to exit the program.

I met the same trouble, i just reset acer password by the following steps,
Step1.Download Smartkey Windows Password Recovery from recoverlostpassword.com anddecompress it on that PC. There is a .ISO file. Burn the .ISO file to CD or USBFlash Driver.Step2.Get out the newly created CDor USB Flash Driver and insert it to the locked computer.Step3. Re-boot the locked computerand then follow the process of instructions. Just after a few steps, the oldpassword will be removed.It can recover all Windows version.

) start phm regedit (google it to find a download location) go to HKEY LOCAL MACHINE>SERVICES>WirelessMGR
2) Edit the key called mutexflag change the value from 1 to 0
3) accept the changes close the program set you phone down and WAIT 15 minutes.
4) reset phone by pushing the reset button on the bottom

Put the phone in Field Test Mode:

From the phone dialpad call ##33284 and then hit send this will turn on the field test program.

Enable Dial up networking over Bluetooth:

Dial ##3328873 and hit send, then check the enable bt dun enable option and reset your phone, you should now be able to configure your PC or laptop to use BT DUN.

Every router has a reset point/button which can be pressed by finger or ball-pen. Locate this reset. After resetting the router it will accept the the default password.

At the back of the unit is a tiny little reset button that you can hit with the tip of a ballpoint pen. It should be located near the power plug. If you press that and hold that button down for about 10 seconds, it will reset the unit back to factory state and you can set the unit back up like you first bought it.

When at the prompt to enter username and password, click on "forgot password" underneath to reset it. You should get a reset password email to be able to access it again.

Have you tried in safe mode? If so, then you will need a password reset tool to reset the SAM file in the registry.
There is one located here: http://www.petri.co.il/forgot_administrator_password.htm
But you will need to learn how to use it as these are tricky and can cause MAJOR damage to your OS.