Nico,
Thanks for the reply. I think I have got a workable solution now. I deleted everything from my computer, disabled AVG, downloaded inimanager.exe again and ran it. It worked. I then re-activated AVG and it detected the virus again. I was able to set an exclusion to stop AVG scanning the file so all is now working.
Just for your information this is the message I got before when it would not install. I think the problem was all down to AVG or at least my version of it (AVG Internet Security ver, 23.9.3302 and an up to date virus definition). All is now good so thanks for your efforts.