How to disable media sensing for TCP/IP
Windows XP contains a feature called media sensing that is used to detect whether your computer is physically connected to the network. If it senses that you're disconnected, it will remove the bound protocols from your network adapter. If you don't want this to happen, you can disable media sensing by following the instructions in KB article 239924 here.
Can't open Office files in Internet Explorer
If you try to open an Office XP/2003 file in Internet Explorer 5.5 or 6.0, you might get an error message that says "414 Request - URI too large," "404 Page Not Found" or "A DDE error has occurred." This happens because the file or path name is too long. You can update IE with the appropriate service pack to fix the problem. For more information, see KB article 416351 here
XP Search doesn't find Office files
If you try to search for files created by Microsoft Office programs with the extensions .doc, .ppt, .xls, etc.), you may find that the Search function doesn't locate any files even though you know that such files exist on the hard drive you're searching. This can happen when you've upgraded or removed Office. For a workaround to the issue, see KB article 312510 here.