@Gazza1158 I think c000001d is an illegal instruction. It can be caused by running 64-bit software on a 32-bit system. You can run a 32-bit program on a 64-bit system, but not vice versa.
Control Panel\System and Security\System will tell you of you have 32-bit or 64bit Windows.
Suggest you uninstall calibre (you wont lose anything), re download the appropriate version and reinstall
BR
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