WinXP
Installation starts but once you get past initial paramaters it disappears and never completes.
And yes, I have tried a clean install.
Thanks
Brian K Mcclung
what version are you trying (just so we are all on the same page) ?
AV software?
free, pro, slim or portable build?
have you tried installing from Safe Mode?
Also Brian did you reboot after uninstalling the previous CCleaner version?