the File is being used by another application

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VB

Hi.
I wanted to run an external application from .net so i wrote it .

Dim p As System.Diagnostics.Process =     System.Diagnostics.Process.Start(Address)
Thread.Sleep(55000)
If p.HasExited = False Then
    p.Kill()
End If

and it worked well actually. But when the electricity goes off my server will not stop the instance of the application
and after starting up the server wants to run the application but here it gives me th error . "the file Is being Used by another application"
I tried to close the file with this code

If File.Exists(Address) Then
    File .Delete( AddressFile)
End If

but it again gives me the same error
what should i do ?