Problems with serial port interface

[lionelgreenstreet at gmail.com]

I've done some tests: i've simulated a serial transmission with
1. Terminal.exe
https://sites.google.com/site/terminalbpp/
2. Com0com
I've made a script that transmit a char every 5ms. The test system is
Terminal---Com0Com---Terminal
so i haven't used my program.
After 3-4minutes the terminal program crashes, so i think that i have an OS problem: what do you think?I'm using Windows7/64bit...
Any suggestion?
Thanks