problem activating FM on new computer

Recently, I had to purchase a new computer. Previously, I had FM installed on two PCs -- one using Windows Vista os and the other using Windows 7 os. The Vista computer developed problems and the hard drive had to be reformatted. FM was erased from that computer at that time. I have installed FM on my new computer, but am getting a message that I have reached the maximum number of activations and that if I don't deactivate it on one of my other computers, it will stop working in 30 days. The help files say that Adobe detects when a problem like this happens and an application no longer works on a particular computer, but it hasn't seen this -- perhaps because I couldn't get online after the crash. Who would I contact or what can I do to deactivate the copy that's on the dead computer? Thanks.