I have experienced this problem with three different PCs with WIN XP installed. The folder option has somehow got missing. I know how to bring it back by editting Group Policy and then Registry. It allowed me to do so three four times on different occasions but now again when 'folder options' got missing and I tried to bring it back by accessing gpedit.msc or regedit, the system restarts as soon as I type either gpedit.msc or regedit from Start>Run. Surprisingly enough I can access other documents and media files located on the computer from Start>Run but not gpedit.msc or regedit. Please solve the puzzle.