Try uninstalling Bit Defender (temporarily) and see if that fixes it.
Make sure the Windows Defender and the Windows Firewall are turned on while testing.
If that does prove to be the case, then download a fresh copy of the latest version of Bit Defender and try that.
Otherwise, you may want to try this (just a guess on my part):
Then please run the following DISM commands to see if there's any problems with the system (from an elevated (Run as administrator) Command Prompt). Press Enter after each one:
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /RestoreHealth
FYI - I have repaired systems using the last command even though problems weren't found with the first 2 - so I suggest running them all.
From this article: http://technet.microsoft.com/en-us/library/hh824869.aspx
You can also run sfc.exe /scannow from an elevated (Run as administrator) Command Prompt to check for further corruption.
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