I am using both XP and Vista on my macBook Pro. Occasionally if i dont suspend or shutdown windows and just put the lid down on me MB windows networking goes to cack !! Restarting windows doesnt correct the issue as the problem lies with the mac, i ran the freeware app Yasu which forces the usual overnight mac cleanup utility to run reboots the mac. Start up Parallels boot windows and everything works !! (You may just be able to re-boot the mac but again sometimes that too doesnt work)
