Close the BlackBerry Desktop Manager application. Disconnect the BlackBerry device from the computer. Double Click on My Computer> Local Disk (C drive>Documents and Settings>(username)>Application Data>Research In Motion>Blackberry>Intellisync Note: If the Application Data folder is not present, click Tools>Folder Options at the top of the screen. Click the View Tab, then click on Show Hidden Files and Folders. Click Apply>Ok and continue through the remaining steps. Delete everything within the Intellisync folder. Launch BlackBerry Desktop Manager and attempt sync the device with the computer.