installation of driver permission denied

I am trying to install a driver but after antony@antony and password etc
cd /home/you-user-name/Downloads and then typed
./ati-driver-installer-11-12-x86.x86_64.run
I get permission denied.
Can someone tell me how to solve this install to the driver please or how to go about doing it a better way.

Ok the commands
chmod u+x ati-driver-installer-11-x86.x86_64.run

sudo ./ati-driver-installer-11-x86.x86_64.run
Didnt work

So Using the file permission suggested by Javier the driver runs but I get the follow message.
You are running a x86 machine with libc5

you need to run this installer as the super user.
Any suggestions? or should I open a new question

Should I use the restricted drivers utility and if so how do I do that?

Catalyst gives me..
For further configuration of the driver, please run anticonfig from a terminal or AMD CCC:LE from desktop Manager Menu..
I ran sudo aticonfig --initial after antony@antony and got command not found.

uname -a gives 3.0.0-12-generic hash20-ubuntu SMP

The ati site is offering a the same driver for 32b again the _64.run at http://support.amd.com/us/gpudownload/linux/Pages/radeon_linux.aspx is it a problem at ati.com or should I update 11.10 32b to 64b and start again?

Thanks

There can be two problems here, you could need superuser rights to be able to execute the file and the file should have execute permissions. So try:

chmod u+x ati-driver-installer-11-x86.x86_64.run
sudo ./ati-driver-installer-11-x86.x86_64.run

Both command should be run after cding to Downloads.

You can also assign execute permissions using the GUI. Rigth click the file and select properties. In the new window go to the permission, you should be able to change it from there.