Activating OCX-file

I am trying to active an OCX-file frpm Java using Jacozoom. This however fails in an intermittent way. Sometimes a null is returned where it should have been a pointer to the activeX-object.

Are there any special permission-issues that needs to be thought of for a non-admin user in Wndows XP?
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First put it in the C:\Windows\System32 folder
If there's a java folder in program files put it in there also
Then register them regsvr32 \windows\system32\<file name>

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