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Getting this error message when starting either of my two Win 7 Enterprise clients, either two of Server 2012 with GUI or my Server 2012 core installations. Host computer is Win 7 64bit and VB version is 4.3.12.

I noticed that this started happening after I registered with Avast....

Here is the log, can anyone help me???

Could you install VBox 4.3.20 and check again? Recently we added code for better diagnostics of this error code.

Thanks Frank, I installed I think version .18 and this seems to have done the trick!! If I have any further problems I will do like you say.

Cheers