Will use another PC and copy for now. But its to do with security rating of such files from SD. Has not happened before. Here is text of Norton description:

Full Path: c:\users\admin\appdata\local\microsoft\windows\temporary internet files\content.ie5\7lt9o2b0\skydemon.2.1.1.msi
____________________________
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On computers as of:
08/05/2011 at 08:13:11
Last Used:
08/05/2011 at 08:14:43
Startup Item:
No
Launched:
No
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Very Few Users
Fewer than 5 users in the Norton Community have used this file.
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Medium
This file risk is medium.
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Threat Details
Threat type: Insight Network Threat. There are many indications that this file is untrustworthy and therefore not safe
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Origin
Downloaded from  URL Not Available

Source File:
skydemon.2.1.1.msi
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File Actions
File: c:\users\admin\appdata\local\microsoft\windows\temporary internet files\content.ie5\7lt9o2b0\skydemon.2.1.1.msi
Removed
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File Thumbprint - SHA:
85ade43320e540f98fc8fd4565ee18d96969f2f869f902bfd60d2482847d8d60
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File Thumbprint - MD5:
a4412f418286f3f23b674f19b02e353b
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Tim  .. perhaps you cd look at this.

D