My computer is macbook pro 1.83GHz with 1.5G memory and guest is windows xp sp2. I just upgrade PW to Parallels Desktop RC. By the way I also reinstalled the tools. Here is the problem: At first, when I opened the PSF on the desktop, it just quited the explorer without any report. Tried several times, finallly, it worked. Then I tried to open PSFOn Mac on Psf from My Network Places, but with no acess. So I turned to open PSF from desktop, guess what, no acess was reported. Well, I had to try a reboot. At this time, same thing happened again.