Yes

Its called telnet or SSH

All you have to do is to enable Telnet in router (or SSH if you want to be secure. But for me telnet should be good as there is no SSH Client out there for Windows by default - unless you could Putty in)

Just go to start -> run and type

telnet 192.168.1.1

It will ask for user/pass. Key in root as user and your router's password as password. You should see a prompt

Simply type reboot and hit enter. It will automatically reboot the router. Simple eh ?