How to add cd/dvd device drivers for win7 in a vm?

**Describe the issue**
If i want to do an fresh usb install from win7 i got the message that are the required dvd/cd device drivers are missing... how to i add these into the current vm?

**Configuration (required)**
* UTM Version: 4.0.9
* OS Version: iPadOS 14
* Device Model: iPad Pro 2020
* Is it jailbroken (name jailbreak used)? Non-Jailbreak
* How did you install UTM? TrollStore v1.4

**Crash log**
If the app crashed, you need a crash log. To get your crash log, open the Settings app and browse to `Privacy -> Analytics & Improvements -> Analytics Data` and find the latest entry for UTM. You should export the text and attach it here.

There's no crash.

**Debug log**
For all issues, _including_ crashes, you should attach a debug log. Open UTM, and open the settings for the VM you wish to launch. Near the bottom of the configuration options (or at the top of the `QEMU` page) is `Debug Log`. Turn it on and save the VM. After you experience the issue, quit the VM and re-launch UTM. Open the VM settings again and select `Export Log...` and attach it here.

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**Upload VM**
(Optional) If possible, upload the `config.plist` inside the `.utm`. If you do not have this, you can upload the entire `.utm` but note this contains your personal data. Since GitHub has an attachment size limit, you may want to upload to another service such as Google Drive. Link it here.

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