Issues installing avast pro

I am a admin for a company how is currently evaluating your guys software. I am seeing some strange behavior.

I had a machine that i installed a msi generated thru the ADNM server, and the machine previously had etrust inoculate on it. There was a massive slow down problem. After some research I decided to remove avast, then I used the cleaner tool from ca, and rebooted into safe mode. I used the avast uninstall util, and rebooted again. Now I am trying to reinstall avast on this machine, but the msi starts up and bails with out doing anything.

Any ideas? This is on XP(32) Sp3.

Mod Note: I did cross-post this due to concern that I am on the wrong board. Feel free to delete from which ever is appropriate.

Remove both CA and avast completely. (for avast use the cleaner tool from the website).
Boot the system, run CCleaner, reboot.
Then try again to install avast.