Netgear Router Login

[#1]

I have a Netgear DG834G v2 router, and I'm having problems logging in to it to check the settings. I have it set up to only allow certain MAC Addresses to access it, and I want to check those. I recorded the username and password about 6 months ago. I have tried logging in by typing 192.168.0.1 in the top bar, but that just results in a error message "This window cannot be displayed". Ditto if I try 192.168.1.1. If I try www.routerlogin.net, that brings up a window for logging in (don't know if it is the correct window), but it doesn't accept my router username and password.
Any suggestions please?
Thanks

[#2]

there is the nuclear option - a hard reset back to the defaults

[#3]

I'd rather not do a reset back to the default if I can avoid it, in case I find I cannot access the internet at all and don't know how to recover that situation. I installed the latest s/w in the router in January or so, and have added one computer MAC address to the Access List about 6 or 8 weeks ago. That computer connected to the internet then, though my visitor hasn't been back since we ran her laptop on my setup
Is there anything a little less desperate I could try first?

[#4]

change the browser cookie settings ?
whenever I cant logging into something its normally a browser config problem like too high a security,
the login popup should return an error access denied page if incorrect details are supplied, if your trying to login from a restricted mac address it just wont work
your option of last resort would be to telnet into the router, before doing a hard reset.
oh and check your firewall settings, its possible if your using mcafee (or similar) you have told it to not trust the router and its blocking the connection.
I wouldn't bother setting up mac address restrictions in the future, half the time they get corrupted and change from deny access to allow access from only those addresses......

[#5]

If I use the IP address 192.168.0.2, the address bar comes back with yahoo.search (or something like that). Is the problem that somewhere on my pc, I have yahoo installed (or it is infecting IE or Google)?

[#6]

You could try connecting by ethernet and use IE as the browser and type in 192.168.0.1  , but think a router reset is the only way forward

[#7]

I'd forgotten about it, but I had this same problem back in July. I never found out what caused the problem then, because, all of  a sudden, the problem disappeared, and I was able to access the router setup. It just adds to the mystery..
Perhaps the router is just getting old.
Anyway, thanks to all for your help, but I  think I will close this topic now.
Cheers