Sorry for the long delay!
First, I can suggest downloading the latest version which is a free upgrade and should work with your existing activation key:
If this does not help, are you able to post this in the Windows forum:
Dear Jaksta support team, hello,
My name is Guy Assaf, I've purchased Jaksta for windows version 22.214.171.124
a while ago and now I seem to have some troubles with monitoring.
When i press " Start Monitoring" an error message pops up and says "Unexpected error - Could not load driver JakNDis."
My order number is P1339944362125.
Please let me know how can I fix this.