Hi,
What is the computer Make/Model?
This is an Example only. On an HP or Compaq system there is a folder in Start > All Programs > Accessories
This folder is for HP Recovery operations. Yours may be Dell PC Tools or some such.
You can Recover Original Drivers, Original software that came with the system or Recover Windows operating system
Look for such a folder on your system to reinstall Microsoft Works
Another option: Run System File Checker to repair/replace missing or corrupt files.
Start > Type CMD > Press Enter
Type sfc /scannow
Press Enter
Use the System File Checker tool to repair missing or corrupted system files
http://support.microsoft.com/kb/929833/en-us
When finished, run chkdsk using Command Prompt window (CMD)
Type chkdsk /F /R
Press Enter
You'll see a message stating volume needs to be locked and would you like to start scan on restart. Press Y and Press Enter
Reboot for the scan to begin
This takes longer than system file checker