Windows Xp sometimes gets affected by a worm due to which you cant see hidden files even though you cange the option in Folder option menu. Well heres a step to do so:
1> Go to start menu, select run then type regedit and press enter.
2> Browse to the following key :-
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
3> Change the Setting of Hidden to 1 in order to show hidden files and setting it to 0 does not show hidden files.

If the above doesnt help then try the below:
1> Go to start menu, select run then type regedit and press enter.
2> Browse to the following key :-
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Advan ced\Folder\Hidden\SHOWALL
3> Now right click on,and delete the value “CheckedValue” in the right hand window.
4> Create a new “DWORD Value” called exactly CheckedValue in the right hand window.
5> Double click on CheckedValue and then type in the box ‘Edit DWORD Value’ ,set the ‘Value data:’ to 1.
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