Indexing is a "feature" to make searches quicker. The idea is to build up an index of the contents of your drive in the background then when you do a search only that index has to be searched and not the whole drive.

The problem is that the background indexer sometimes seems to pounce on a newly written file before the program doing the writing has finished with it, leading to a conflict. Thats why I suspect the Indexing in this case.

There is no harm at all in switching it off, you can still do searches as usual.

In My computer, right click on the drive, go to properties and untick the indexing box. Do that for each drive and whenever you add a new drive.

regards
prixat