In order to install the ultimate drivers from ATI, that is Catalyst 4.4, you have to run the exe file first and it should create an ATI directory. After that the installation begins and you get an error message but everything is not lost. You just have to manually install the driver that is go the video properties, select your card, click on change the pilot and say that you want to look for a driver in a specified folder. In my case, the folder is
C:\ATI\SUPPORT\wxp-w2k-8-00-040322a-014266c\2KXP_inf
depending on the OS you have you then have to select the proper inf file. Only by doing this your video card driver will be updated.
If you need further explanation, you can visit this site :
http://www.driverheaven.net/patje/It will tell you about a little program which mods(or patches) catalyst in order to install it on your laptop.