Avast won't install

[REDACTED]

Hi. Have tried installing Avast Free Antivirus but nothing seems to happen. All that happens when I run the installer is a grey box appears with the Avast logo in it and a blue line that moves from side to side. Initially I assumed that it was working but after three hours I figured something was wrong. All I get when I run the installer is the same grey box with the blue line for hour after hour after hour... I have attached a screen capture of the box I'm talking about. The light blue line just goes from left to right and back again. It gets kind of hypnotic after a few hours.

[Asyn]

- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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Windows 7 Ultimate, Service Pack1, 64 bit.

Was previously using Norton 360. It has been uninstalled and I'm not running any other security software.

[Asyn]

First, be sure to get rid of all remnants of your prior installed AV(s)..!!
-> https://support.avast.com/article/11/

Then:
1. Download Avast Free Antivirus: https://files.avast.com/iavs9x/avast_free_antivirus_setup_offline.exe
2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)
3. Reinstall Avast with the downloaded installer from point 1.
4. Reboot.

[REDACTED]

Nothing has changed. The installation file that I downloaded initially was avast_free_antivirus_setup_online_a1l.exe but using avast_free_antivirus_setup_offline.exe has made no difference.

There are no earlier versions of Avast installed on this computer and I've run the Nortons removal tool twice.

[Asyn]

OK, let's check for an infection...
Start a new topic in V&W and post your logs there: https://forum.avast.com/index.php?action=post;board=4
Instructions: https://forum.avast.com/index.php?topic=194892

[REDACTED]

I've created the new post. Strangely, when I download the installation file using Chrome rather than Internet Explorer the box that appears when I run the file looks like the attachment. The orange stripe just goes round and round, sometimes longer, sometimes shorter.

[Asyn]

OK. Side note, only download from Avast directly..!!
The "_a1l" part in your OL-installer is quite suspicious...

[REDACTED]

That file came from Avast. If you go to the Avast page it's the only option you get. https://www.avast.com/en-au/lp-ppc-hp?device=c&ppc=a1&gclid=EAIaIQobChMIlteVmY_61wIVh5W9Ch2ddQsXEAAYAiAAEgLW9PD_BwE&gclsrc=aw.ds&dclid=CMeFzJuP-tcCFdSYvAod51gMBg

The most recent copy I downloaded doesn't have the "a1|" on the end but the same thing happens if I run it.

[Asyn]

Just wait for a reply in the V&W section...