Windows 8.1 vs 7 Problem

[cwoolsey 0]

I have an AutoIt Script that is basically an inventory system that works with an excel sheet. I have the entire folder and ALL of the files that the script uses on a Public drive on my Private Network, so it is the EXACT same script and files running; however, when I run the script on one computer in my office that I'm developing the script on (that runs Windows 8.1) it works great. When I run the program on the Inventory computer that is running Windows 7 it throws an error that says Line 228, File C:\ProgramFiles\AutoIt3\Include\Excel.au3 Error: Variable must be of the type "object".

What does this error mean, and why does it ONLY come up when I run it on my Windows 7 machine?

[ViciousXUSMC 82]

Does that computer have Excel installed?