Hello Christiaan,
I would suggest you first you need to cleanup your registry, please refer the below link for your reference.
communities.bentley.com/.../25551.how-to-clean-up-the-system-for-successful-reinstallation-of-the-applications
Once cleanup is done then reboot and restart your system, then I would suggest you if it's fresh system then install prerequisites first and then install the software.
Note: You need to set UAC to “Never notify” . Open User Account Control Settings by clicking the Start button, and then clicking Control Panel. In the search box, type UAC, and then click Change User Account Control settings.
Do one of the following: To turn off UAC, move the slider to the Never notify position, and then click OK. If you're prompted for an administrator password or confirmation, type the password or provide confirmation. You will need to restart your computer for UAC to be turned off.
Please let us know if this resolved your issue.
Regards,
Purva Lakde