I installed Parallels Desktop 4 on my Mac with no troubles. It worked perfectly and I've had no troubles with mouse synch, Coherence, etc. My wife logged into her account on the machine, ran Parallels Desktop 4 for the first time, and was confronted with a new installation option. She canceled the installation wizard and quit Parallels. I'm trying to make it work correctly, now. I can run Parallels and connect and run my BootCamp WinXP VM. However, Parallels Tools doesn't seem to install, there's no mouse synch, Parallels (in a window) won't auto-scale the WinXP resolution to fit, it's sluggish, and the Windows New Hardware Wizard appears everytime asking to download Live updates. I searched the documentation (both built in the PD4 downloadable PDFs) for "user accounts" and "accounts" and can't find anything in the morass of technicalia. What do I do to get it working on a second account as on the first account I?