Thanks Hans
I don’t mind mountain climbing but anything serious to do with a computer scares me silly.
I installed the 64 bit version of 7zip and once I figured out how to tell the computer to use the right application within that to open the 7zip file, the big file opened and I was able to apply the .exe file to get things going and installed. In the end the default location the installation chose was program files x86 which I think is the 32 bit folder but it all seems to be ok now.
Many thanks again for your response.
Cheers
Peter