Hello,
All programs have bugs, especially since all machines are different.
We are here to get information in order to fix the bugs, so that more and more machines are working "out of the box".
To me it sounds like a HDD incompatibility.
Have you uploaded crash report when the software asked for?
If not, please do so and we will analyse it.
Also, can you tell me what manufacturer your HDD are?
EDIT: As a workaround, you can uncheck "MBR scan" in (scan) settings.
Regards,