In August Microsoft will be pushing out an update for all of their supported Operating Systems. This includes Windows XP, Vista, 7, Server 2003, 2003 R2, Server 2008, and 2008 R2. This update will block the use of cryptographic keys that are less than 1024 bits. This must happen because with the evolution of technology it is becoming easier to crack weaker keys with less and less time.
You should determine whether or not you are currently using keys less than 1024 bit to prepare for this update. If your are using keys less than 1024 than you should plan to update your keys to 1024 bit or above. You can get help with this following this link (here)