64bit vs 32bit

[jayton13]

I have an application that does not behave correctly in 64 bit windows 7. I have previously run the software in windows 7 32 bit successfully, and had to revert to an old 32 bit XP machine to properly execute the program this time.

There are no errors, and the program appears to operate correctly with 1 major flaw.

The program simply processes data out of a serial stream. On the 32 bit machines - this works flawlessly. When executing on a 64 bit machine, there appears to be a "flicker" in the data where somehow data is being missed or some sort of delay. This results in incorrect data collection and missed triggers.

Any suggestions?

[Dsun]

It's a 32-bit application that you run on both the 32-bit and 64-bit OS right?  Do you have any other 64-bit OS machines?  It's possible that it's a problem with the computer itself as opposed to the application.

[jayton13]

It was tested on multiple 64bit machines with the same problem on each. The exact same software was run on one of the exact same machines last year with no problems, but last year the machine was running the 32bit version of Win 7.