Issue with Terminal command

[Devon Pillay]

Hi there

I would like to report a bug since i installed fedora 11 and updated the
softwares i am getting issue with installing applications through the
terminal as its not allowing me to type in any password. therefore i cannot
login as root to install some drivers for example i got a beta driver from
XFX support team for my graphic card.
I downloaded and used the command:
cd /home/Movied/Desktop to get to desktop where i downloaded the driver
/chmod + xNVIDIA-Linux-x86-195.30-pkg1.run to execute the driver
I got some error that i did not have the access to install the driver
though i did try su -l  then tried to type the pass no change. Though i know
the password i cannot type in any password
. I am a new Linux user and i am just learning all the commands.
 please email me back if you can help.
Regards
Deivom