Parallels Desktop 7 和 MAC 10.8 lion 好像有冲突，我这里碰到几次死机都是跟他有关。所以我就准备删除它。
首先需要删除已经有的虚机。删除方法参看：
http://kb.parallels.com/cn/5029
删除Parallels Desktop 7步骤：
在终端以此输入下面命令停止Parallels Desktop 7并删除它。
sudo launchctl stop com.parallels.vm.prl_naptd
sudo launchctl stop com.parallels.desktop.launchdaemon
sudo launchctl stop com.parallels.vm.prl_pcproxy
sudo kextunload -b com.parallels.kext.prl_hypervisor
sudo kextunload -b com.parallels.kext.prl_hid_hook
sudo kextunload -b com.parallels.kext.prl_usb_connect
sudo kextunload -b com.parallels.kext.prl_netbridge
sudo kextunload -b com.parallels.kext.prl_vnic
sudo kextunload -b com.parallels.filesystems.prlufs
sudo rm -rf /Library/Parallels
sudo rm -rf /Applications/Parallels\ Desktop.app
sudo rm -rf /Library/LaunchDaemons/com.parallels.desktop.launchdaemon.plist
sudo rm -rf /Library/LaunchAgents/com.parallels.*
sudo rm -rf /Library/Python/*/site-packages/prlsdkapi
sudo rm -rf /usr/bin/prl_perf_ctl
sudo rm -rf /usr/bin/prlctl
sudo rm -rf /usr/bin/prlsrvctl
sudo rm -rf /usr/bin/prl_disk_tool
sudo rm -rf /usr/share/man/man8/prl*
sudo rm -rf /var/db/Parallels/Stats/ParallelsDesktop.*
sudo rm -rf /usr/lib/parallels
sudo rm -rf /Library/Filesystems/prlufs.fs
sudo rm -rf /Library/Preferences/Parallels
sudo rm -rf /Library/Logs/parallels
参考资料：http://kb.parallels.com/cn/112189
如果您看到“No such file or directory”信息，'则表示常规卸载已移除目录中的此文件，您需要继续。
或者直接先执行
sudo w，给密码；
然后粘贴以下命令：
代码：
rm -rfd /users/~you~/library/preferences/com.parallels*”
rm -rfd /users/~you~/library/preferences/parallels/*”
rm -rfd /users/~you~/library/preferences/parallels”
sudo -s rm -rfd /private/var/db/parallels/stats/*
sudo -s rm -rfd /private/var/db/parallels/stats
sudo -s rm -rfd /private/var/db/parallels
sudo -s rm -rfd /library/logs/parallels.log
sudo -s rm -rfd /library/preferences/parallels/*
sudo -s rm -rfd /library/preferences/parallels
sudo -s rm -rfd /private/var/db/parallels
sudo -s rm -rfd /private/var/.parallels_swap
sudo -s rm -rfd /private/var/db/receipts/’com.parallels*’
sudo -s rm -rfd /private/tmp/qtsingleapp-*-lockfile
sudo -s rm -rfd /private/tmp/com.apple.installer*/*
sudo -s rm -rfd /private/tmp/com.apple.installer*
sudo -s rm -rfd /private/var/root/library/preferences/com.parallels.desktop.plist
dscacheutil -flushcache
sudo rm -fr ~/Library/Logs/parallels.log
sudo rm -fr /Library/Preferences/Parallels/
sudo rm -fr ~/Library/Preferences/Parallels
sudo rm -fr /private/var/.Parallels_swap
sudo rm -fr /private/var/db/Parallels/Stats
sudo rm -fr /private/tmp/qtsingleapp-Parall-c0ce-0-lockfile
sudo rm -fr ~/Library/Preferences/com.parallels
移除后如果想安装 Parallels Desktop 8 可以参看下面的帖子：
http://bbs.weiphone.com/read-htm-tid-6303663.html
卸载完成后当然需要重启电脑。