I may try the Frog next.
I have 5 XP installations here and none of them will start the jitter scan reliably.
I have 1 Win2k installation and this one does the jitter scan okay.
The Win2k is a "barebones" system with only Nero installed. InfoTool shows no "System" aspi installed but it does have the "Nero" aspi installed. After much testing with XP, I'm not sure this is relevant.
I also have a "barebones" XP installation and no matter what I try, it doesn't start the jitter scan. I tried putting the Nero aspi in various folders, but it had no effect on CDspeed. InfoTool showed no aspi installed. I then installed Nero and now InfoTool shows "Nero" aspi installed. But jitter test still doesn't work.
In the end, only Win2k works. None of the XPs will run the jitter.
By the way, I found a surefire way to get the jitter test to start. Just run InfoTool. As soon as InfoTool scans for drives, the jitter test will run. Unfortunately this puts a spike in the scan, so it's not a good solution.