If you donīt know which version you have installed I strongly adivise to get the last and newest patch before you even start the game and before you even create the first character.
The first versions were unstable and buggy and the deinstallation routine had an error which could wipe your harddisk when deinstalling the game - so check which version you have and if it is not 1.4 then got and get it:
Pool Of Radiance
Edit: If you donīt know which version of the game you have - look at the lower right corner of the screen when in the Main Menu - there should be written 1.4 and a date.