You need the Recovery Console or an XP CD. XP Home doesn't have the recovery option but the Pro version does. Are you seeing a blue screen with a Stop Error message and if so, what is that message? We need the numeric 0x0000?? and ANY_WORDS_JOINED_UP by underscores.
Have you tried tapping Function 8 when you power up to see if you can select Safe Mode with Command Prompt from the Advanced Boot menu?