I installed linux Red hat 7.2 for the very first time. I chose to operate
at medium security.But I forgot to memorize (or at least write down ) my
login info. How do I get past this impossible login screen
- remove redhat and install Mandrake 8.2
-which nic card works well with D-link routers.

do the same as i have told to vivek. in topic
can't login as root