Avast Clean Install

[ragweed]

Whats the best way to do it since I have Malware on my system That disables Avast during download. Thanks!

[Lisandro]

Read the instructions, download and burn (maybe from another computer), finally use one of this rescue CD's:
1. G Data BootCD
2. Dr. Web
3. Avira
4. BitDefender
5. Kaspersky
6. F-Secure
7. Vba32 Rescue

When you get clean, I suggest an installation from scratch:

1. Download the latest version of avast! Uninstall Utility and save it.
2. Download the latest avast! version and save it.
3. Uninstall avast from Control Panel (if possible). If, for any reason, you can't run it, try booting in Safe Mode and doing it from there. Anyway, boot after that.
4. Run the avast! Uninstall Utility saved on 1. If, for any reason, you can't run it, try booting in Safe Mode and doing it from there. Anyway, boot after you've run it.
5. Install avast! using the setup saved on 2. Boot.
6. Register your free copy or add the license key for Pro. Or even upgrade your key from old versions.
7. Check and post the results. If, for any reason, you did not solve, try doing the step 3 in Safe Mode anyway.
8. Run a full avast scanning and send any infection to Chest.

[Asyn]

Whats the best way to do it since I have Malware on my system That disables Avast during download. Thanks!

If you have malware on your system, you should clean it first.
http://forum.avast.com/index.php?topic=53253.0