I have been developing an application for my pda for several days but today something weird hit me. I worked for a few hours, i closed my laptop and when i opened it again Windows Mobile Device Center couldn't find my mobile device. I am trying for few hours and i really don't know what to reinstall to get it back. This is getting really ridiculous, please give me a hint. I am using windows 7 64bit.
Try system restore to the last restore point if its available.
Also to se if its USB issues try to use this utility USBVIEW to uninstall it.