Thought that I would let you know that I have fixed all my network problems.
1) To stop loosing my network connection I set my Wireless Zero Configuration to Disabled (Control Panal/Administrative Tools/Services) Since making the change I haven't lost the connection for the last four days.
2) The access problem was an ASP.NET issue. To resolve this I went into Control Panal/Administrative Tools/Local Security Policy/User Rights Assignment. Once there I removed ASPNET from all the options bar the first. Since then I have been able to access the main computer from the second computer without any problems.
Just thought that this might help other who are having a similar problem.
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