Here are two free source office programs:
1- Apache OpenOffice 4.0 : Here are steps to install open office
Step 1: download open office, click here to download
Step 2: double click on downloaded Apache_OpenOffice_4.0.0_Win_x86_install_en-US.exe
Step 3: Click Next
Let the program unpack
Step 5: Click Next
Step 6: You can put either username or organization name. Select "anyone who uses this computer", and then Click Next
Step 7: You can select Typical for setup type. It will install
OpenOffice Writer
OpenOffice Calc
OpenOffice Draw
OpenOffice Impress
OpenOffice BaseOpenOffec Math
Programs
Click Next
Step 8: Click on Install
Let it finish installation
Step 9: Click on Finish
Step 10: To start open office either you can go start --> All programs --> OpenOffice 4.0.0 or there is also a link on desktop which you can click on it and start the OpenOffice.
2. LibreOffice: This a free source office program too.
Here is the link to download it :
http://tdf.mirror.rafal.ca/libreoffice/stable/4.1.0/win/x86/LibreOffice_4.1.0_Win_x86.msi
installation is almost same as above.