3 Ways to Safely Delete Unused MSI and MSP Files from Windows Installer Folder

Solid State Drives (SSD) are fast becoming the norm for many users to place their Windows install onto, but because prices for the larger drives are still quite expensive, many users have smaller capacity drives. If you have a smaller SSD or your Windows boot drive or partition isn’t that large, you need to watch every Gigabyte that goes onto it or its space can fill up pretty quickly. Using tools such as TreeSize or SpaceSniffer to find which folders are taking up precious space on your drive might show that the Installer folder located in Windows is one of them.

If you check the Installer folder in Windows (C:\Windows\Installer), you will most likely find a lot of MSI and MSP files in there taking up a few gigabytes of your hard drive, with some people even reporting 10GB+. Do note that the Windows Installer folder has a hidden and system attribute. To see the folder, you will need to select “Show hidden files, folders and drives” and uncheck “Hide protected operating system files” from the Folder Options in Control Panel. Viewing the Property details of those MSI and MSP files in the Windows Installer folder could show that they are connected to software currently installed on your computer and others most probably from software you have uninstalled which you don’t use anymore. The good news is some of the MSI and MSP files are orphaned and no longer needed which you can safely delete. The big problem is identifying them because just deleting any MSI or MSP file you choose is a bad idea as they might be required for updating, patching or uninstalling existing applications.

Below is an Office 2003 MSP file from an old installation.

MSP Property Details

Use an old Microsoft Utility

One of the old tools that could do this was MsiZap which was developed by Microsoft. The tool is available with The Windows Installer Clean Up Utility (Msicuu) which is basically a frontend for some of MsiZap’s commands. Microsoft discontinued both MsiZap and Msicuu some time ago after saying they were causing too many issues, but many users still use MsiZap with some success. Download the Windows Installer Clean Up Utility and then extract it with 7-Zip to use the MsiZapU.exe.

Open a Command Prompt, type MsiZapU.exe G and press enter. The G command tells the program to remove any orphaned cached Windows Installer data files. While testing we got an error on both Windows 7 and XP similar to the following although it did say it had cleared some orphaned files out.

MsiZapInfo: Performing operations for user S-1-5-21-598190838-2299067166-971484642-1000
Removing orphaned cached files.
Error enumerating Products key for S-1-5-21-598190838-2299067166-971484642-1000 user. Error: 6.
FAILED to clear all data.

MsiZap is definitely a tool to be used with caution because Microsoft usually don’t pull utilities unless there’s a valid reason to do so.

Windows Installer Unused Files Cleanup Tool

The Windows Installer UnUsed Files Cleanup Tool (WICleanup) by KZTechs is able to scan for orphaned MSI and MSP files in the \Windows\Installer folder and offers you an option to delete them from the comfort of a graphical user interface. For scripts and command line usage, WICleanup also includes a command line version in the archive (WICleanupC.exe).

Windows Installer UnUsed Files Cleanup Tool

All you need to do is extract the downloaded ZIP file, run the WICleanupUI.exe and click the Scan button. All the entries that show in the window are orphaned files and manually check the boxes for what you want to delete. Although it has no option to automatically select all files for deletion, you can use the Shift key to multi-select, i.e; click the first file, hold Shift and click the last file, then click one of the selected tick boxes. It would have been useful if this tool offered an option to backup the unused files instead of deleting them in case of any potential problems. Note the the website is in Chinese.

Download WICleanup

Deleting the Unused MSI Entries Manually

Before you simply go into the C:\Windows\Installer folder and start deleting files on your own to free up some space, there is a way to determine which files are orphaned and should be safe to delete. Because the patch files still registered will have a corresponding entry in the registry, those that are missing aren’t necessary anymore.

Heath Stewart over at blogs.msdn.com wrote a small vbscript a few years back that checks the system for registered patch files, and lists those that are. This way you will be shown the files that you SHOULD NOT delete from \Windows\Installer as they are the ones still in use, those not in the list are safe to remove

Download WiMsps VBScript

Do note that this download isn’t the original vbscript found on the website as that has an annoying OK popup on every registered entry it comes across which can be very annoying because there’s often loads of them. We’ve made a minor modification to output the registered entries to a text file instead.

WiMsps output

Don’t forget, these are the currently registered patch files and the ones to not touch. We would recommend you don’t manually delete files from the Installer folder anyway without some experience, and moving them to another folder just in case a problem occurs is more preferable.

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