: Faulty RAM or a failing hard drive can corrupt files as they are being read or unpacked during installation.

: If you are using a front USB port on a PC, try a port directly on the motherboard (at the back) to ensure a stable power supply and data flow. 2. Run System Repair Tools (If Upgrading)

: The most frequent cause is a faulty ISO file or a USB drive that had a write error during the creation process.

: In some cases, the system’s registry has invalid paths for the Windows Installer services. Step-by-Step Solutions to Fix WinSetup.dll 0xC1 1. Recreate Your Installation Media

: Flash drives can develop bad sectors. Try a high-quality USB 3.0 drive.