Whenever I've seen that error that is usually indicative of a group policy. If this is a standalone machine, yes check those registry settings. If this machine is joined to a domain, and you are not an administrator on that workstation, or the domain admin you will not be able to change those.
Tom Cieslik
It looks like there is no option for you to change settings if you're not domain admin, but you can try convert OST file to PST.
There is a log software you need to pay for