Thanks for the response. Please let me know if any other information would be useful. I am really running out ot ideas here. I don't want to have to abandon the project though.
This is the start of the log file.
NB the proxy cited at the start is no longer in the set up
--- Opening Log file [April 29 20:50:23 UTC]
# Windows CPU Systray Edition #################################################
###############################################################################
Folding@Home Client Version 6.23
http://folding.stanford.edu
###############################################################################
###############################################################################
Launch directory: C:\Documents and Settings\cc
[21:10:32] - Ask before connecting: No
[21:10:32] - Proxy: 217.146.181.34:80
[21:10:32] - User name: cathc (Team 163897)
[21:10:32] - User ID: 767E0660323B9A86
[21:10:32] - Machine ID: 1
[21:10:32]
[21:10:32] Work directory not found. Creating...
[21:10:32] Could not open work queue, generating new queue...
[21:10:32] Initialization complete
[21:10:32] - Preparing to get new work unit...
[21:10:32] + Attempting to get work packet
[21:10:32] - Connecting to assignment server
[21:10:32] + Could not authenticate Assignment Server response
[21:10:32] + Could not authenticate Assignment Server 2 response
[21:10:32] + Couldn't get work instructions.
[21:10:32] - Attempt #1 to get work failed, and no other work to do.
Waiting before retry.
[21:10:48] + Attempting to get work packet
[21:10:48] - Connecting to assignment server
[21:10:48] + Could not authenticate Assignment Server response
[21:10:48] + Could not authenticate Assignment Server 2 response
[21:10:48] + Couldn't get work instructions.
[21:10:48] - Attempt #2 to get work failed, and no other work to do.
Waiting before retry.
[21:11:08] + Attempting to get work packet
[21:11:08] - Connecting to assignment server
[21:11:09] + Could not authenticate Assignment Server response
[21:11:09] + Could not authenticate Assignment Server 2 response
[21:11:09] + Couldn't get work instructions.
[21:11:09] - Attempt #3 to get work failed, and no other work to do.
Waiting before retry.
[21:11:34] + Attempting to get work packet
[21:11:34] - Connecting to assignment server
[21:11:34] + Could not authenticate Assignment Server response
[21:11:34] + Could not authenticate Assignment Server 2 response
[21:11:34] + Couldn't get work instructions.
[21:11:34] - Attempt #4 to get work failed, and no other work to do.
Waiting before retry.
[21:12:24] + Attempting to get work packet
[21:12:24] - Connecting to assignment server
[21:12:24] + Could not authenticate Assignment Server
The closing reports in the log file
[16:31:22] + Attempting to get work packet
[16:31:22] - Connecting to assignment server
[16:31:22] - Couldn't send HTTP request to server
[16:31:22] + Could not connect to Assignment Server
[16:31:22] - Couldn't send HTTP request to server
[16:31:22] + Could not connect to Assignment Server 2
[16:31:22] + Couldn't get work instructions.
[16:31:22] - Attempt #119 to get work failed, and no other work to do.
Waiting before retry.
[17:17:22] Opening ...
[17:19:35] + Attempting to get work packet
[17:19:35] - Connecting to assignment server
[17:19:35] - Couldn't send HTTP request to server
[17:19:35] + Could not connect to Assignment Server
[17:19:35] - Couldn't send HTTP request to server
[17:19:35] + Could not connect to Assignment Server 2
[17:19:35] + Couldn't get work instructions.
[17:19:35] - Attempt #120 to get work failed, and no other work to do.
Waiting before retry.
[18:07:40] + Attempting to get work packet
[18:07:40] - Connecting to assignment server
[18:07:40] - Couldn't send HTTP request to server
[18:07:40] + Could not connect to Assignment Server
[18:07:40] - Couldn't send HTTP request to server
[18:07:40] + Could not connect to Assignment Server 2
[18:07:40] + Couldn't get work instructions.
[18:07:40] - Attempt #121 to get work failed, and no other work to do.
Waiting before retry.
[18:41:01] Opening ...