SDL Studio 2017 won't open!

Hi,

 

Everytime I try to opn SDL Studio 2017 I get following message and the Studio won't open. Can anyone help? It is really urgent...

 

"An instance of EventSource with Guid 74af9f20-af6a-5582-9382-f21f674fb271 already exists."

 

Thanks in advance!

 

Thanos

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