For those wondering about safe mode in WDP, there are 2 ways to get into it.
1) For safe mode on next boot (or till you turn it off manually), use the regular msconfig way. In msconfig, click boot tab, check "safe boot" and radio button "minimal". Hit OK. You can restart straight away or later, next boot will take you to safe mode.
Safe Mode - Start Windows 8 in
2) For a permanent safe mode boot menu entry, use this trick.
Safe Mode - Add to Windows Boot Manager in Windows 8




Quote