I don't use Bitdefender, but it shouldn't be too difficult to uninstall.
Follow the steps outlined below.
1/. Right click on the Windows logo extreme left-bottom of desktop.
2/. Left click on Control Panel.
3/. Left click on Programs and Features.
4/. Locate the Bitdefender entry and right click on it.
5/. Select Uninstall....and all 'should' be well.
Let us know the outcome.
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