I have the exact same problem. I'll just copy past from a former thread I made:
I'm running a
AMD Athlon 64 3200+
1500 RAM
Win XP SP 3
So yesterday my computer suddenly started getting slow, so I rebooted. When the machine boots, it's all fine, but just after the Windows loading screen, the screen goes black, and the only thing that's active is the mouse cursos which I can move. But I can't right click or anything etc.
I can't bring up the Task Manager. I try loading in safe mode but it's still all black, with the expection that the text "Safe mode" is written around the black screen.
So what I did was I got a Ultimate Boot CD and loaded from it. I managed to roll back my windows registry to 2003 (manufactor fresh), and now windows actually loaded and I didn't get the black screen anymore, however obviously it was all a complete mess having a registry from so long ago, so I backup rolled it back to the current again, and the black screen returned.
With that logic, shouldn't it be possible to do some tweaks to the registry to solve this issue?
I'm a complete beginner and I barely even know the function of the registry. Everything i've tried so far i've just managed to google and follow step by step instructions, so bare with me. But judging from the tools in the Ultimate Boot CD, I can access the windows registry.
So basically, where do I take it from here?
Any help would be greatly appreciated.
I tried looking into what gkalwan wrote, but I couldn't find anything named "midi9" in that registry pathway