I already got two bluescreens this morning when running PuTTY (version 0.63.0.0, which is the newest version as far as I can tell). I have a microcontroller that sends data to a serial-to-USB converter. The driver for the converter is called "Prolific USB-To-Serial Comm Port (COM12)". The driver version number is 22.214.171.1243 (date 2013-10-17). So this seems to be up-to-date as well. I run Windows 7.
The data gets transmitted flawlessly until the bluescreen appears. Is this a problem of PuTTY or the serial-to-USB conversion? Is there an alternative to PuTTY that I can try (HyperTerminal seems to be no longer available on Windows 7).