Problem Synchronising Blackberry Bold 9700 with Microsoft outlook in Windows7 x64

Hi,
I have a Blackberry Bold 9700. I synchronize it with Outlook express 2007 version for tasks and memos. I don’t use any messenger email systems on my phone. The DM I’m using is v6 bundle 2949. I use windows 7 x64 architecture. When I try to synchronize by connecting to a computer, I get this error message, “Cannot log on to the exchange server error.
Please check server access or provider a valid password”.
I was using this feature for so long and suddenly this problem arose.
Please help me find a solution to this problem.
