You can not change the file or folder permissions in windows xp home. You are limited to "Simple filesharing". But there is a workaround.
- Restart your computer in safe mode
How to: Hold down the key F8 during computer startup
Select safe mode
- Use your administrator account in safe mode
- Find the folder whose permission you want to change
- Right click on folder and select properties
- Change permssions
- Click ok!
- Restart computer