I installed the DiscSpeed (downloaded directly from the Nero website) and installed it on my Win7 x64 machine. I used it to do a Quality check on some CDs I burned with my iHAS524. Worked okay. Then I wanted to do the same for some DVDs, and read about the registry tweak to get a 4x Jitter read. I used the SetJitterSpeed utility and when I tried to do a Quality check DiscSpeed hung right when that little panel pops up to do I guess a quick speed check of the disc.
I downloaded the CDSpeed-SE3-47716 version available here and the same thing happened. What gets me is the Nero DiscSpeed variant gets installed, but the CDSpeed-SE3-47716 is a self-running version. I uninstalled DiscSpeed and wiped the registry and tried reinstalling without the SetJitterSpeed tweak. Same thing. Both of them are now hanging. I even (fortunately) did a Create Restore Point before doing even the original install, so I did a System Restore and tried reinstalling DiscSpeed again. No luck. Both it and CD-DVD Speed hang.