There are so many free and paid tools available at Internet to recover passwords of Operating systems and software like MS-Office etc.
If you are using Windows XP and want to recover the password then you should need to download Ophcrack v3.3.1 (LiveCD v2.3.1). With this software you can create a boot able CD.
You should need to boot your system from that CD then your machine will boot from CD using Linux system and this is a powerful tool to recover all passwords in text mode or graphical modes.
Also you can download password recovery tools for MS-Word, MS-Excel from Internet using search engines.
Editor & Diamond Member - IndiaStudyChannel.com