If WP originally came with the computer, then it may be on one of the restore disks which usually have backup copies of applications preinstalled at the factory. If you need a spreadsheet application, then check to see if MS Works was installed.
Now, if you still
need a word processing/spreadsheet application, you can download the free OPEN OFFICE
which has very robust applications, and is compatible with Office files. I use it all the time myself.http://www.openoffice.org/