Why does my computer reboot after i set PE bit of cr0 or run lmsw? I have set all the code and data segments

There's a blurb over on WikiBooks about entering protected mode. I've never done it (nor do I care to) so I know nothing about it. However, if you are not doing all of the things listed there your pc will decide that something is horribly wrong and reboot.

Hope this helps.

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