Debian Synaptic locked up after trying to install Dropbox

Hello,

I am running LinuxCNC (Debian Wheezy), I tried to install Dropbox via Synaptic Package Manager, apparently Dropbox is a dead stick on that OS.

Now Synaptic is unable to start with the following message:

 	 	 	   E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.  

E: _cache->open() failed, please report.

I ran this command in a terminal, it showed it was installing Dropbox through 100%, once done it just sits there, and Dropbox will not open.

Is there a way to fix this short of reinstalling the OS?

Once I have synaptic running again I will use a different program to Network with.

Thank you in advance

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