URLmon registering and audio driver probs - are they connected?

Dear Anyone.

Yup, still on XP because of disability problems, would cost a fortune to upgrade my software to 10. Anyway.

My music writing software, Quick Score Elite Level 2, suddenly came up with 'Can't Find Audio Out'. So I thought I'd start trying to fix the prob. by reinstalling the motherboard - Foxconn 2ADA - sound software. (I'd scanned for viruses using Malwarebytes before doing the download.) Downloaded the software, decided to create a restore point incase I boll - er - mucked things up(!), went to Start/All Programs/Accessories/System Tools and got 'Can't Find Entry Point in URLmon.DLL'.

So I did a REGsvr32 on Urlmon.dll and got told it had been re-registered successfully. Went back to System Tools and clicked on Restore Points but didn't get the proper window, just a totally empty white window with a blue frame, no program or options or anything. Thought that would be because I hadn't restarted the PC after re-registering URLmon, so I restarted.

And when I went back to System Tools, I got the 'Can't Find Entry Point in URLmon DLL' error AGAIN!

So I registered it again, got told it had registered successfully again, clicked on system tools/restore points and just got the fake window, as above, again. Restarted the computer (again!) and System Tools went back to 'Can't Find Entry Point!'

Why isn't URLmon STAYING re-registered!?! I don't want to re-install the sound software without a rollback point incase something goes wrong and I don't understand why System Tools is just coming up as a pale empty window even WITH URLmon re-registered. I've tried the REGsvr32 /i switch but that hasn't helped. It registers when you're IN windows, the moment you restart it loses its registration, every time.

Any ideas anyone?

Yours hopefully

Chris.