I just plugged my AVRISPmkII into my Win7/64 machine, and AVRstudio5 upgraded its firmware. After that it is useless in studio5 on Win7/64 and 32, and also in studio4 on Win7/32.
Any hints on how I can force it back to a safe state? The message I get in studio5 on Win7/64 is:
AVRISP mkII (00B000000093)
Timestamp 2011-04-19 20:34:40.403
Unable to connect to tool context ".
Am I missing Win7 drivers?