Windows fertilizes!

[#1]

Is it worth re-indexing the files ?

[#2]

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@Anonymous wrote:

Do you get a duplicate if you simply create a file?

Also, do you know when this started, had you installed anything new at the time?

If the above is true are you able to return to a restore point?

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I have created a .txt file just now and no duplicate has shown. 

The problem has appeared over a while: I cannot recall anything new installed or removed to cause.

[#3]

Did you ever run a restore from a backup?

[#4]

@VileReynard Not as I can remember.

@Champnet I don't understand, what re-indexing would do- be for.

[#5]

Viewing lists of files most applications are reading the indexes otherwise you'd be waiting ages for reading, sorting & presentation. If the indexes are corrupt then you will see strange results. Won't do any harm to re-build the indexes.

Is it obvious I'm from  a database background ?

[#6]

@Champnet I'm from a debased background!

TBH I'm not technically sure on rebuilding an index, as a tech rocking horse.