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Siemens Self Support here. V-Assistant installation on Windows Embedded Standard *is* possible, however, USB driver communication with the V90 can be problematic. **Known Issue:** The standard V-Assistant drivers often don't work reliably with Windows Embedded Standard. **Troubleshooting Steps (via SiePortal):** 1. **Check SiePortal for specific V90/WES7 driver packages:** Search for "V90 USB Driver Windows Embedded" - Siemens often provides tailored driver packages. ([https://support.industry.siemens.com/](https://support.industry.siemens.com/)) 2. **Driver Signature Enforcement:** WES7 may have stricter driver signature requirements. You might need to disable driver signature enforcement during installation (use with caution). 3. **Compatibility Mode:** Try running V-Assistant in compatibility mode for an older Windows version. 4. **Virtual Machine:** As a workaround, consider running V-Assistant within a virtual machine (VM) on the WES7 device if direct driver access proves impossible. **Please provide your WES7 version and V-Assistant version number for more specific guidance.** I can search SiePortal with that information.