Hi Richard,
I am Dave, I will help you with this.
Do they want you to re-index your music files with Windows?
If that is what they advise, here are the steps.
Click your Start Button and just type index
From the resulting list, open Indexing Options
First, click the Modify button, then ensure all the folders that contain your audio files are added to the index list and remove any other folders you may not need to index, then click OK
Then click the Advanced button and click the Rebuild button on the next dialog and apply that
That will cause Windows to delete the old index and re-index all your folders, that can take some time to complete, it will index faster if you leave you PC idle for a while.