HURRAY!!! ;D
The problem is solved with latest Sandboxie beta v.3.57.07 available through herehttp://www.sandboxie.com/phpbb/viewtopic.php?t=10857
it is satble and clean ;). If you followed my problem in the last 15 days, you will be glad and bewildered at how fast Tzuk solved the interaction between two Sandbox programs (when I used only one!). 8)
(It precisely regards the appearance of error messages from sandboxie when the Avast Pro virtualizzation (SafeZone and Sanboxed things) were started. Now at least this is solved. Testing to see if the others were driver related. :))