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The most obvious thing I would recommend reconfirming is that you have been installing "Altera Starter Edition", not "Altera Edition".
I have Modelsim-ASE installed on WinXP on several machines and have not seen this type of issue.
I also have several versions of Quartus and Modelsim-ASE installed in virtual machines.
Perhaps you can try installing VirtualBox, install WinXP, and then install Modelsim-ASE.
You could also file a Service Request directly with Altera and perhaps they might have some other debug suggestions.
Cheers,
Dave
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Dave,
Thanks for getting back. I've confirmed the most obvious things (see included screen shots), and tried a multitude of other
combinations. Installing as Administrator made no difference. I've tried the 12.1SP1 variant and several other builds with and
without various service pack inclusions. Always done on a fresh install of XP-SP2 (and SP3). All with the same negative result.
I've tried it on a completely different PC (AMD vs Intel). Ditto.
I tried to post a service request - but had no luck...
I need to get in touch with someone that knows the internals.
Thanks again.