Hi Nige,
In the Symantec-Norton System Works/Antivirus product in the Miscellaneous tab, see if turning off the 'Office Plugin' then
restarting the Office apps lets you open the documents.
============
Installed latest tech beta release of Office and now I am unable to open any
documents whether new or existing. When I try and open them I get an error
message saying the file is unavailable. Any clues? Is my Norton System Works
2005 causing an issue? >>
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I hope this helped you,
Bob Buckland ?

MS Office system products MVP
LINKS to the 2007 Office System
1. Free MS Office 2007 book from MS Press, 213 pages:
http://microsoft.com/learning/office2007/default.mspx#booksfrommspress
2.. Office 2007 Beta 2 Online Test Drive, Downloadable beta,
e-learning courses, doucmentation and movies:
http://microsoft.com/office/preview
3. Send 2007 Office System Beta 2 feedback directly to the MS Office 2007 product team with this feedback tool:
http://sas.office.microsoft.com/
4. Try the 2007 OfficeOnline preview website , without Office2007
a. Install the ActiveX access control
http://office.microsoft.com/search/redir.aspx?AssetID=XT101650581033
b. then visit
http://officebeta.iponet.net