Urgent Help! Format Notebook?

It is easy, you could type in "Format c:" in DOS mode. (The most clear method)
But before you doing this, you must ensure you get a bootable XP CD with valid serial no. and go to this site to download the driver disk for X24 : http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-39808

Otherwise, you have difficulties in find the driver afterwards especially if you cannot find the LAN card to go to internet to search for help.

If there is any issue, you may have choice to get the service to format your notebook with XP in Shenzhen, their fee is low, my experience is $150 only. Just in case if there is any thing getting wrong.

Good Luck.