Question : C#.net program

hello,
A c# programmer sent me a executable C# program to do the same thing my access form is doing. At home i use vista with visual studio 2008- I unzipped his program and installed it- it did not work right- message box came up wrong time and command buttons did not work like i wanted. I told him this program is not working right-
I went to work and he told me he had made changes- I use xp at work and visual studio 2008 express-i also had told him to make program with .net 2.0 - because some of pc's off network - am not sure if newer versions of .net installed. I opened program and it worked great- I told him problem solved-
Now i brought program home and the same thing is happening- not working same way as before-
I guess when he sends me code- I can open at work and figure out at work and then recreate the whole thing at home- but question:
Is there any reason it should not work at my home?
do not understand what is wrong.
( the program does connect to an access 2003 database)
my home computer has access 2007- do not know if that matters
thank you

Answer : C#.net program

Ask him to create exe for compatible to all CPUs, in build configuration you should have option for exe compatibility platform, it is x86 and x64, and all cpu.

Create exe's for all three type to test. I hope All CPU option will work with all of your machines/OS.