ACAD 2015 Fatal Error module not found - ACAD wont load

[robinhill833400]

Can anyone please help?
This morning tried to open AutoCAD 2015 as usual,
instead it reports
"ACDrawBridge.dll Module not found
Exception at fd2b940dh"

I have been running ACAD 2015 without problem since it was released, ie about 6months.

As I cant open ACAD I cant access support.

Does anyone know how I can repair this error?

I Urgently need any help or suggestions.

Thankyou

[robinhill833400]

OK,
I solved it.
Oddly the USB connector to my external drive had been physically broken whilst I was away from the office, presumably hit by a vacuum cleaner!
Moving the external drive to an intact USB port resolved the problem.
I find this strange as ACAD is installed on the internal C: drive and the external drive is just for back up so I am surprised ACAD fell over when it didnt find it,
and I dont understand why it should look there for .dll files.