Newer computers come with a recovery partion, from which you can burn a set of CDs/DVDs that can be used to restore your computer. If you did not burn the disks previously, cannot boot to Windows, and don't see an option to launch the recovery system when you try to boot then your only option is to purchase a new CD, either from Dell at a nominal fee (~$30) or retail at full price (~$100).
A while ago my PC became unresponsive. I called dell and for about $75 they told me that then NTFS file system was corrupt and how to fix it. They told me how to reset it to factory settings but I forgot how. NTFS is corrupt again. There is no Windows XP CD (Dell no longer gives you one.) Im running Windows XP Media Center Edition 2002 with service pack 2. Anyone know how to factory reset?