Avast does not update and cannot uninstall

I received this message when trying to uninstall Avast 6

Error reading product data from C:\Program Files\Avast Software\Avast\setup\part-setup_ais-557.vpx.setup cannot continue

I can not restore my computer to an earlier time either, because it tells me that an anti virus program is preventing it.

Avast is telling me to fix the software..........but it won't let me fix it.

HELP!!!!!!!!!!!!!!!!

I suggest an installation from scratch:

1. Download the latest version of avast! Uninstall Utility http://www.avast.com/uninstall-utility and save it.
2. Download the latest avast! version and save it.
3. (Optional) If you want, save your avast! settings for later restoration (Settings > Maintenance > Back up).
4. Uninstall avast from Control Panel (if possible). If, for any reason, you can't run it, try booting in Safe Mode this is done by pressing f8 when u restart your machine and doing it from there. Anyway, reboot after that.
5. Run the avast! Uninstall Utility saved on 1 in Safe Mode. reBoot after you've run it. Repeat this for any major avast! version you have ever installed/upgraded in your computer.
6. Install avast! using the setup saved on 2. Boot.
7. Register your free copy or add the license key for Pro. Or even upgrade your key from old versions.
8. Check and post the results. If, for any reason, you did not solve, try doing the step 3 in Safe Mode anyway.

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