"end had to uninstall then grub about in the c:\Programme files(x86) folder to find and delete all 7-zip folders and files."

You may now have some programs that will not work as they used to!

7-Zip is used by a lot of programs to compress and decompress files. This can't be done by Windows zip program!

If you have problems with the function of some of these programs, you may have to reinstall those.