Hi Marc. I'm Greg, a volunteer installation specialist and 8 year Windows MVP, here to help you.
Right click task bar to open Task Manager. If necessary show More Details
On Details tab look for msiexec.exe, highlight to End Task.
Now try install or uninstall again.
If this doesn’t help you can try to Fix problems that block programs from being installed or removed:
https://support.microsoft.com/en-us/help/17588/...
This can be symptomatic of corruption. I would go over the integrity of your install by working through the steps for Windows 10 Performance Troubleshooting:
http://answers.microsoft.com/en-us/windows/wiki...
Feel free to ask back any questions, or report back results as you go.