Unreal editor won't launch giving errors about dlls

When I try to open the editor, it doesn’t open but gives me loads of errors titled UEeditor.exe - Bad image. They contain the path to a .dll file and a message saying that it is either not compatible with windows or it is damaged or corrupted.
I found this in the launcher log; I don’t know whether it is related.
[2015.10.04-15.04.52:732][ 0]BuildDataGenerator: FATAL ERROR: EBuildPatchInstallError::ApplicationClosing

Hi Link4565,

Try the steps in this section of the troubleshooting guide.

If nothing works, follow the steps here to generate you Debug Logs. Make sure to post the entire set of logs and also your Dxdiag (system specs).

Hi Link4565,

We haven’t heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you’re still experiencing this issue, please try the suggestion that I mentioned above. Then post back here with the requested info.

Cheers,

TJ