Upon trying to install some games just like Civilization V on the computer, some PC users will find that the installation process just stops or freezes when starting talking about installing Steam. And sometimes, they will receive this error message: “Error 1500. Another installation in progress, you must complete that installation before you can continue with this one”. Same as Failed to find steam error, this Steam error 1500 will stop them from installing the desired games or playing some games correctly.

The first step you should do is to restart the computer and try another installation. Sometimes, the Steam error 1500 will disappear after a system reboot. If not, you can re-install the Steam again. But first, you should click onto the “Add / Remove Programs” feature of Windows, and remove all the parts of the application from your PC, like so:
* Click on Start button.
* Open Control Panel and double click on Add or Remove Programs.
* Select the Steam and Remove/Uninstall it.
When you uninstall applications improperly then some traces are left behind in the computer and when you try a fresh installation of a program these traces create conflict situation with the valid registry entries which causes applications to crash similar to the Steam. After you have uninstalled the Flash player from your computer, run a thorough system cleaner scan with some good registry cleaner and PC optimizer scan. The registry errors, active-x and Steam error 1500 can be easily sorted out with a software recommended by experts.
If you cannot fix the Steam error with the above solution, you should update your Graphics driver.
If the problem still exists, you need to update your graphics driver by obtaining an update from the manufacturer’s website, or go inside your “Device Manager” console and upgrade your device from there. To ensure that the problem is not caused by an outdated Windows version, you need to get the latest fixes from the Microsoft website by clicking Start -> All Programs -> Windows Update and follow the update wizard. You need to restart your computer for the changes to take effect. If the Steam error 1500 still happens, keep on reading for some helpful tips.
Another method that can be used to get to this point when trying to get rid of any messages concerning Steam error 1500 can be used. This is done by opening the Start menu, then choosing the Run option. Now type in msconfig and press enter. This will also open the dialog box for the System Configuration Utility.
The final step is to download a “registry cleaner” tool and fix the various problems that Windows may have with its settings. We’ve found that one of the biggest causes of issues for your PC will be the way in which the registry database of your system will not be able to be loaded correctly – leading your system to run much slower and with a lot of problems including the Steam installation error 1500. The registry is basically a database of important information & settings that allows Windows computers to open the likes of their most recent emails and desktop wallpaper. If you are experiencing Steam error 1500 on your system, it’s likely the case that the registry database is causing the errors, and needs to be resolved.
Want to install your favorite games correctly? Are you looking for solutions to deal with the Steam error 1500 but with no clue on what you should do? Take the above solutions right now and you can use the computer and play your desired games correctly.
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Ive been trying to install steam over the past few days but it keeps on saying error 1500 another installation is in progress but i know there isnt my windows intaller is set to manual and i tried closing down msiexc.exe thing. I tried to fix the registry error as you said here and then successfully installed the Steam properly.
I want to install steam but when i start installing it it says error 1500 and it says that there is another installation going on but i know there isnt i tried re-downloading it and i tried restarting my computer couple of times but still it keeps happening. Thanks to tell me how to fix the error.