That's definitely weird.

Try uninstalling Aurora completely from your system via Control Panel and download a fresh copy from http://www.mozilla.org/en-US/firefox/aurora/

Make sure you don't remove your personal settings in the uninstaller

I tried this. When I try and run the install file I get the "cannot create temp archive folder" message

Hi,

Have you tried running the install file as Administrator? Right click > Run as administrator

Also, try downloading the full version instead of the compressed installer

• http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-aurora/

You want the firefox-30.0a2.en-US.win32.installer.exe located near the bottom.

P.S. This error message comes from the stub file that tries to unpack the archive to start the installation and creates a folder in the temp folder to do this and seems to fail to complete this operation.

opening as administrator didn't help. I tried to open the ftp file. Same issue

Try clearing out your Temp folder and running the FTP file as Administrator.

To get to the Temp directory, Press the Windows key + R to open the Run command, and type %temp% press Enter.
Delete everything in that folder.

I tried that too.

Problem solved. It was a corrupt user account. I created a new one brought across the appdata local and roaming mozilla profiles and its now ok.

Thanks