Try Phone/Chat support - For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat or phone option...
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Creative Cloud support (all Creative Cloud customer service issues)
http://helpx.adobe.com/x-productkb/global/service-ccm.html ( http://adobe.ly/19llvMN )
It is not possible to deactivate the subscription from particular computer(Even from Customer Support also). if you do not have access for the computer from which you want to deactivate the subscription.
However , when you try to activate on 3'rd computer , you will get an pop up message indicating , Maximum Activation limit exceeded .
In the same pop up window , look for the option "Sign out from all computer/devices" .
Select the option and proceed with the Activation process.
It will not remove CC apps from computer , it will just signs out the activation from previous computers.
There by resetting the Activation count to 0 , so that you can activate the CC apsp again on any of the 2 computers of your choice.