Sync only works once qwith drvupdate-amd64.exe

Hi,

I'm setting up the sync between Vista business 64-bit and my pocket phone
E.ten M700. I use this only to sync with my Outlook. I use USB.

To get it working, I installed drvupdate-amd64.exe. After that, the sync
center finds my smartphone and syncs. However, if I later plug in my pocket
phone, the plug and play doesn't kick in the sync center. Instead, I get the
autoplay window where I can browse the phone, or can synchronize media files.
The only way to sync again is start again the drvupdate-amd64.exe
installation.

Any idea to get the sync working when I plug in my phone?