Can no longer sync Outlook

[Lennys]

I hope someone here can help. I have the Sprint Diamond and Win 7. Has all worked, but suddenly I cannot sync with Outlook. The device is recognized by the device center, but I get the following msg:

"Synchonization cannot be started because you are not able to log on to the network and access information. Restart your computer and synchronize again. If the problem persists contact your network administrator" (I guess that would be me!).

I have searched here and all over and tried all the suggestions which unfortunately has left me with removal of all my contacts from the phone after I reestablished a new partnership.

I'm not sure if the problem is with my phone and a hard reset will work, or with the computer. There have been suggestions that it is outlook (I run 2007) I repaired the Mapi32.dll.
I have seen others having the same problem, but no solutions. Anybody have any ideas?. I even e-mailed HTC, but they gave me the same stock suggestions which I have done.
Lenny