said by TROLL131313 :

Did you buy the router new? Also, did it come with a CD?

Whats on the CD if it came with one?

The reason I ask, is SDM has been replaced with Cisco Configuration Professional. If the CD has the full version, it my not be on the router.

Now, if SDM did come on the CD with the router, you will need to set a few things in IE. Also, you will need sun's java for the SDM light and full to work.

IE:
Set "Allow programs to run active content off my Computer" This is under the advanced settings tab.

Set all pop up blockers off.

Now for the startup tips:
Set your PC to get its IP Address from a DHCP server and shut it off.

Then turn the router on fist and let it boot up before you start your PC. After its up, start your PC and then check your IP config in your command prompt. If it lists any thing other then a 10.10.10.x address, you will have to do a release and renew to have it get the right IP. "This is a big issue with Vista"

Now you should be able to start SDM express in IE by typing there routers IP address.