On the old forum http://forum.shavlik.com I have ask the same question.
Reply from Shavlik Support (AR) is: try the current XML files 22.214.171.1248.
I have tried it: the same result, stscanbrowser.exe crash.
Is this a specific HFNetChkPro Plus 6.1 problem? I can’t simply update to 7.x
6.1 is no loger supported and the newer xml versions have special code embeded, so 6.x crash.
After doing the update to HFNetChkPro Plus 7.6.1496.0 you need to refresh the license and it's working.
Thanks to Shavlik support ( Andy Radwell and Dylan Hudak )