I'm PC based, and I just went through the process of upgrading to 64 bit Windows. What a pain! As an aside, that's another big advantage for MacOS that you don't have to choose to install 32 bit or 64 bit.
I haven't tried the PSP42 with Ableton, so I haven't seen the bug Per mentioned. In fact I haven't used PSP42 in a while. As I upgrade or reinstall Windows, I find I don't have the patience to reauthorize all my copy protected VSTs. The paid apps that I really use are Ableton, EnergyXT, Stylus RMX and Trillian. Everything else I use is freeware, which is still an advantage of PCs. I looked for a freeware delay where you could crank the speed up and down like you can on the PDS8000, but I didn't find one.
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Art Simon
simart@gmail.com