1.get into the BIOS for your IBM ThinkPad T40 laptop and setup (remove ) the Master Password . you will get a unlock Hard Drive from your "locked" HDD .
2.Make an external hard drive to back your data if you want. Please remove your hard drive from your laptop and let in a USB enclosure.
3.if your hard drive cannot boot, if your Data error cannot let you back it up, if your “My Documents” Locked from a Password in windows, you will need Unlock a "locked" Folder of “My Documents”: please have a look.