In my pc all folders are in read only mode how to fix this issue
Folders in Windows XP can not be read-only. Windows will never display a regular check-mark in the read-only box when you open a folders properties, unless the folder is on a read-only disc such as a CD-ROM. Normally you should see a greyed out check mark, a green square, or whatever symbol your theme uses.
As Microsoft would say: "This is by design."
The square (or greyed out check mark) for a folder means NOTHING, NO CHANGE, WAITING FOR YOU TO USE ME. This is because the read-only box in a folder's properties is only used to apply or remove the read-only setting from all of the folder's files at once. If you clear the box and click Apply, then the files in the folder will be cleared of any read-only attributes they have. Like wise for checking the box to apply the attribute to all files. The square reappears the next time because, once again, you haven't used it.
FOLDERS do NOT have a functional read-only attribute in Windows. The read-only attribute is only for files. The read-only check-box for folder properties is a bad and confusing design. If you want to avoid read-only confusion, check individual files, ignore folders.
Windows file systems actually use the read-only attribute for a folder to make it customizeable, but the checkbox in a folder's properties has nothing to do with that. You cannot prevent a folder's contents from being changed using the read-only attribute. You can read more about that here: