Barry
From your System Information file
[Problem Devices]
Device PNP Device ID Error Code
Virtual Disk Bus Enumerator ROOT\SYSTEM\0001 39
Type Device Manager in the Search box above the Start button and press ENTER. Are there any yellow question marks in Device Manager? If yes what is the Device Error code.
To see Hidden Devices (Non Plug and Play Drivers) you need to select View, Show Hidden Devices. It is necessary to do this every time you open Device Manager if you need to see them.
A further complication can be Ghosted Devices –installed but not connected!
http://www.lockergnome.com/windows/2005/04/29/display-hidden-devices-in-device-manager-xp/
Error codes in Device Manager:
http://technet.microsoft.com/en-us/library/cc771355(v=ws.10).aspx
In Device Manager right click on the device and select Properties, Details tab. You will see displayed Property and Value. To the right of Property is a scroll. From the list accessed using the scroll, select Device Description and this may give an understandable Device Name as the value. Use the scroll again and select Device Instance Path. The value shown will most likely mean nothing to you. Place the cursor on the value, right click and copy into a further message here.
Please check the chipset installed version:
http://www.tomshardware.co.uk/forum/209590-30-which-chipset-driver-version-have#.
Please upload and share with everyone copies of your System and Application logs from your Event Viewer to your Sky Drive and post a link here.
To access the System log select Start, Control Panel, Administrative Tools, Event Viewer, from the list in the left side of the window select Windows Logs and System. Place the cursor on System, select Action from the Menu and Save All Events as (the default evtx file type) and give the file a name. Do the same for the Applications log. Do not provide filtered files.