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
____________________________
____________________________
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
____________________________
____________________________
Very Few Users
Fewer than 5 users in the Norton Community have used this file.
____________________________
Medium
This file risk is medium.
____________________________
Threat Details
Threat type: Insight Network Threat. There are many indications that this file is untrustworthy and therefore not safe
____________________________
Origin
Downloaded from  URL Not Available

Source File:
skydemon.2.1.1.msi
____________________________
File Actions
File: c:\users\admin\appdata\local\microsoft\windows\temporary internet files\content.ie5\7lt9o2b0\skydemon.2.1.1.msi
Removed
____________________________
File Thumbprint - SHA:
85ade43320e540f98fc8fd4565ee18d96969f2f869f902bfd60d2482847d8d60
____________________________
File Thumbprint - MD5:
a4412f418286f3f23b674f19b02e353b
____________________________

Tim  .. perhaps you cd look at this.

D

I have just attempted to download the 30 day free trial (21:15 Fri 13, May) and get exactly the same message from Norton. I'm not incredibly computer literate and so have no idea how to get past this.

I'll try and get in touch with someone who can help. Just thought you should be aware.

Nadders