Rustys,
Thanks for your help.
I have been able uninstall the original Wireless driver and downloaded, from the manufacturer website, the latest driver.
When I try to load this onto the faulty PC to C:\DRIVERS\WIN\WLANINT and it seemed to instal. As this completed the program Intel PROSet/Wireless Software Tool Installation Wizard opened ...Preparing to install...This then failed with the message " The Windows Installer service could not be accessed. This is because of running in Safe Mode ( which I wasn't) or if the Windows Installer is not correctly installed.
I have no appreciation as to what the issue is with the Windows Installer is.
So I'm now at the point where I have no Wireless Network Connection on the PC
Thanks
Alba