Some of them can help fix your problem.
QuickFontCache.dll Not Found
QuickFontCache.dll is adynamic link library file, essential to the operation of FL Studio.
It is recommended that you should back up your important data regularly to protect your data.

MiniTool ShadowMaker is afree backup softwarethat can be used for a one-click system backup solution.
Of course, file & folder and partition & disks are also available for backup.
Backup schemes and schedules can be chosen for a better experience.
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Step 1: OpenSearchby pressingWin + Rand inputCommand Promptto chooseRun as administrator.
Step 2: In the window, typesfc/scannowand pressEnterto execute the command.
Step 3: Just wait until the process has been finished.

Then you could execute the next command DISM /Online /Cleanup-Image /RestoreHealth.
After that, you could exit the window and reset your setup to see if the error persists.
Step 1: InputWindows SecurityinSearchand go to theVirus & threat protectiontab.
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Step 2: Click onScan optionsand chooseFull scanand then clickScan nowto start the process.
When the scan finishes, Windows Defender will show you the results and you might follow to fix that.
Here are 10 tips to fix Windows Defender wont scan on Windows 10/11.

Also learn how to scan with Microsoft Defender Antivirus on Windows 10/11.
Fix 3: Clean Up Disk Space
Another method is to clean up disk space.
Step 1: Open File Explorer and go toThis PC.
Step 2: Right-hit the drive you want to clean up to chooseProperties.
It is necessary to keep your Windows up to date so that everything on your system can perform well.
Step 1: Go toStart > parameters > Update & Security > Windows Update.
Step 2: ClickCheck for updatesfrom the right panel and Windows will start downloading and installing the available updates.
Then it’s possible for you to restart the system to verify if the QuickFontCache.dll is missing.
Bottom Line:
Struggle with the QuickFontCache.dll not found issue?