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It's possible that the TUN/TAP drivers are causing your Mac to get a blue screen on start up. The following procedure removes these files from the start-up sequence.
Start up in single-user mode by holding Command-S after restarting the computer. Note that single-user mode always uses the US English keyboard layout.
Type these commands, each on a single line followed by Return:
rm -f /Library/Extensions/tun.kext
rm -f /Library/Extensions/tap.kext
rm -f /Library/StartupItems/tun
rm -f /Library/StartupItems/tap
reboot
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