I've just tried to run a cd and when i open it it comes up with window saying it can't find wpi.hta. Where can i locate this on my computer and open this program?

depends, my wpi.hta is inside a wpi folder at the root of my cd. Others will have it in different places. It may be at the root of the cd.

is this a standalone cd with only wpi on it? Or was it a cd that installed an operating system and was trying to run wpi when it was done? More info would be helpful.