There are some manual clean uninstall instructions in the below link that should help.
https://knowledge.autodesk.com/support/fusion-360/troubleshooting/caas/sfdcarticles/sfdcarticles/How...
Are you running Avast anti-virus software by any chance? It may help to add exceptions for Autodesk Fusion 360, if you are. We have also noted instances where the display driver man need to be updated for adcefwebbrowser.exe to function normally.
https://forums.autodesk.com/t5/design-validate-document/fusion360-doesnt-start-properly/td-p/5953300...
I note the executable should be located in a directory similar to below:
C:\Users\%PROFILE%\AppData\Local\Autodesk\webdeploy\production\<Build Specific ID>\Win64
One other thing that may help is to toggle the Auto-detect proxy settings:
Mac OS
1. From the Apple menu, select System Preferences
2. Select Network
3. Select the correct network (ethernet, wireles, airport, etc)
4. In the Proxies tab, enable/disable Auto Proxy Discovery
5. Apply changes and retest
Windows
1. Browse to Control Panel\All Control Panel Items\Internet Options
2. In the Connections tab, select LAN settings
3. Try to Enable/Disable Automatically detect settings option
3. Apply the changes and retest.
I hope one of these suggestions helps!
Thanks,
Nathan Chandler
Principal Specialist