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You have a typo here (MissingStncWM instead of MissingSyncWM). And if it fails, it could just mean it's already unloaded. You can cut and paste...
I know the missing sync kernel extension is unloaded fine for me, but something else is still tying up the USB port, stopping parallels grabbing...
In my case, for all beta versions through RC2, an XP guest gets an IP assigned via DHCP, but only after a while (10's of minutes maybe) or I...
Just edit your virtual machine network adapter setting and choose en1 for the adapter. hth charles