Command line problems

While trying to set up my wireless network I lost communications with my router and now I can not access my command line. It gives me a "write fault error writing device aux , abort, retry, ignore, fail?

 

and when trying to retry, a pop up windows appear with the following info;

 

c:\windows\system32\cmd.com . The NTVDM has encountered an illegal instruction . CS:0000 IP:11d2OP:463261 choose 'close' to terminate the application.

 

I am now lock out of my command line and wireless router set up, I already tried to use the 192.168.2.1 subnet, can anybody. Can anybody help me restore my command line?

 

Thanks