The easiest way to clear the Windows XP history of searched files and folders is:

1. Copy / Paste the following to an ACMRU.reg file:

REGEDIT4

\[-HKEY_CURRENT_USER\Software\Microsoft\Search Assistant\ACMru\5603\]

\[HKEY_CURRENT_USER\Software\Microsoft\Search Assistant\ACMru\5603\]

2. Merge the ACMRU.reg file with your registry.