Hello i ahve a netgear dg834g. I have tried to default using the admin and password. Password seems to have been changed, idont know it, what do i do know? please help

The first solution is to reformat your system, while it could wipe your data.
if the data is very important, you could try some password unlocker tool to remove the pw, it generally takes few mintures.Hope helpful.

If you don't want to reformat your system, I think you have to make a rest disk or use some tool to do all the job for you. Such as Windows Admin Password Recovery . Burn a boot CD with the program, and insert it into the problem computer and your password will be reset to "Blank". http://www.windowspasswordsrecovery.com

Have a look here.

A Windows password reset bootable disk could do all the job for you, it can reset your lost or forgotten Windows password safely and quickly without login, you can create a Windows password reset bootable disk with the tool Windows Password Breaker, then use it to reset your password.