I installed Zwift on my acer Windows laptop.
When I click let’s go… the app disappears. I asked an IT friend to check and he told me that the prefs.xml files give an error and are empty.

Uninstall & reinstall might be your easiest option? (I thought it would recreate a new prefs.xml from scratch if it was missing, though.)

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It does. Seen this invalid thing come up loads of times on here and never understood what the problem is. Maybe it’s the PC preventing Zwift from writing to the Documents folder in some way.

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Re-instal didn’t work. Same issue time after time

OneDrive or the likes of it? Anti-Virus?

Try disabling/uninstalling (if exist.)