Hopefully, the message you are receiving is telling you what file is missing or cannot be found. Once you know what the file is, then do a seach in the file Manager (right click on Start, then select Explore). If this does not find the file you need, then determine if this file is one which comes with the program, or if it is a Windows file. If it is the latter, Either find it on your installation disc, or just try reinstalling windows.
If you had listed the file name, it would be much easier to tell you what steps to take.