Hi thanks for reply
Yea i tried that, I was actually able to do a restore all the way back to putting my windows product key in (from the repair install) but the error was still there.
I'm working on my laptop instead now while my pc does another repair install using the iso.
What's confusing me, is that if it is ccleaner, then why only on my pc will it create the problem? I have Win 7 Home and 7 Ultimate on two other laptops which i use ccleaner on and have no problems.
Do you think this thread is anything to be concerned with Windows Installer is not functioning properly/Error 1723 when - Microsoft Community
Its someone with the same problem, and there is mention of a virus, however this is only virus related answer i have seen in while searching the net about error 1723 (most people all seem to have the error with Java install/uninstall)
Hopefully this second repair will fix it again, if it doesn't...I'll be totally confused