View Hidden Files - WinXP

At first I'm using folder options to view the hidden files options. Using the folder Options, I cannot get the Hidden File & Folders Box to stay checked. I check it and close the options box and re-open it and it is un-checked again. At last the solution is:

1. Start --> Run
2. Type = regedit
3. Find

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL

4. Find 'CheckedValue' at the right box
5. Double click the 'CheckedValue' and change the value to 1
6. Press OK

Here you are. You can view all your hidden files now.