I've just come across the same problem as well. At work they gave me new headsets, Plantronics C325 and I'm having the Sound 1 error. I've uninstalled Parallel Tools and restarted. Upon re-installing Tools, at 76% of the installation, I got the sound 1 error and now it's just hanging at 76%. Don't know what to do now since it's not even installing all the way now. I'm on Windows 7 and Parallels 9.
Update: Parallel Tools did eventually install all the way. Restarting now. After installation, I'm not getting the error but I'm not getting any sound either. Seems like there's no driver. Wasn't Parallels Tools supposed to take care of that? Never mind I had to unplug the headset and reinsert it and change the connection to my parallels. Problem solved.
Last edited: May 21, 2014