WINMM.dll

Hello,

Thank you for your interest in Windows 10.

I would appreciate, if you can provide us the following information to help us understand the issue better?

• Which application are you trying to install on your system?
• Are you getting this message while installing all the applications?

I would suggest you to follow the methods given below and check.

Method 1: Perform Clean Boot.

Placing your system in Clean Boot state helps in identifying if any third party applications or startup items are causing the issue. Check this issue in clean boot state.

1. Press Windows key + X key. And select Run.Type msconfig in the Run box and hit Enter.
2. On the Services tab of the System Configuration dialog box, tap or click to select the Hide all Microsoft services check box, and then tap or click Disable all.
3. On the Startup tab of the System Configuration dialog box, tap or click Open Task Manager.
4. On the Startup tab in Task Manager, for each startup item, select the item and then click Disable.
5. Close Task Manager.
6. On the Startup tab of the System Configuration dialog box, tap or click OK, and then restart the computer.

Note: After clean boot troubleshooting step, follow the section "How to reset the computer to start as usual after troubleshooting with clean boot" in the provided link to return your computer to Normal startup mode.

If issue still persists try method 2.

Method 2:

Try to run a System File Checker (SFC) scan to check for any file corruption. SFC scan will scan for corrupt system files on the computer and repair them.

1. Press Windows key + X, click Command Prompt (Admin).
2. In the Command Prompt, type the following command, and then press ENTER:
   sfc /scannow

If the issue still exists, try the next method.

Method 3:

You may check the same issue with the new user account.

Try these steps to create a new user account and check if it fixes the issue. Refer to the steps below to create a new User Account:

1. Go to Settings.
2. Choose Accounts and then select Other User Accounts towards the left.
3. Select Add an Account.
4. Enter a user name and hit Next.
5. Click on Finish.
6. Sign out from the current Account and Log into the new account.
7. Check if issue persists.

Hope this information is helpful. Do let us know if you need any further assistance, we'll be glad to assist you.