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I have been trying to update my Adobe Flash Player for hours.

I've read the forum, downloaded the uninstaller, restarted on every attempt. Tried for Firefox and IE.

When I click on the downloaded icon, it disappears and this message comes up: "only one instance of this application can run".

Also checked Adobe and other various sites for a solution. I need my browsers, with Flash.

Can someone help?

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what version of Windows? – Jeremy W Mar 29 '12 at 20:18
this sounds unintuitive but I saw it reported on a forum. Try uninstalling Microsoft Silverlight then reboot then reinstall Flash. – Jeremy W Mar 29 '12 at 20:35
Reboot, open your downloads folder in Windows Explorer (without starting a browser), double-click on the downloaded file. – Daniel R Hicks May 30 '14 at 10:59
Reboot. You probably have a crashed instance of the installer "running." You can also kill it through task manager but since you're asking the question I would suggest the reboot route. – Loren Pechtel Jan 22 at 1:02
Alternate route: in Firefox, install Shumway (may or may not be sufficient for the goal you try to accomplish, if there's some site you're trying to view) – TOOGAM Apr 23 at 15:09
  1. Delete the downloaded file.
  2. Open a browser, redownload it.
  3. Reboot into Safe Mode with Networking (F8 after BIOS), install newer version of Flash.
  4. Reboot into normal Windows.

Probably excessive, but simpler than looking for the potential rogue processes.

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