When you install the Windows XP SP1 update, during the Inspecting your current configuration phase you receive:
Update.exe - Unable to Locate Component This application has failed to start because netdtect.dll was not found. Re-installing the application may fix this problem.
You have a 3rd party driver trying to link to the old Netdtect.dll library, which is no longer provided with Windows.
NOTE: The CNet Pro200WL Fast Ethernet adapter is a likely culprit.
When you get this error, you can safely ignore it. There is nothing to reinstall.
To continue the installation:
1. Press OK.
2. Go get a cup of coffee, as Windows may hang for up to 15 minutes.
3. The installation will continue as expected.