NT2000? Perhaps Patrica means Windows2000? Win2k was the update from NT as Win98 was the update from Win95 (basically.) In a clean install of Windows2000 there is no option to restart in DOS mode like there is in Windows98. There is a recovery mode, but that is not DOS mode and it causes about as many problems as it attempts to fix. Best bet would be to call on your local geek to check out what's happening.
As far as following the information from MODERATION above, moderation IS one of the CureZone moderators and is a computer geek.