I have used the removal tool several times along with a reboot after use. Have now also downloaded yet another virus program (360 Safe Global) which found 2 trogan.Generic and 2 HEUR/malware - all in the NetCache. These were quarantined with no apparent effect on the problem.
I have also now ran a Registry Cleaner (RegServe) several times. It does show a recurring File/Path References result which shows to be fixed but reoccurs every time I run the cleaner.
Lavasoft Registry Tuner shows an Application Paths problem and an Uninstall Entries problem - which also show to be fixed when I run the program, but return as before, each time I run the program...