I am gonna be reformatting my system and can't remember which drivers I did install and since I run a different type of setup I don't think it will work with other version..
If your using the CP version: Display properties-> Settings -> Advanced -> Options tab, should be at top. Or go to device manager -> display adapter, expand it (click the + ), right click your card -> properties, then driver tab. It will tell you the date of the driver. There might be an easier way, but can't think of it. Sorry I have no Idea if your using the CCC except for using the device manager route.
If your using the CCC, then click on the + for the Information Centre, and click on the Graphics Software, it will tell you in there which version of the CAT's you are running, i.e 6.9 etc...
Actually I just went to C:\ATI and it shows what ATI software I have installed. Given my AIW and seperate Theater 550 tuner I need to be carful which drivers Iam using as they don't all work and it took me a long time with trial and error to get a working dual tuner PIP set-up.