Sometimes you just have too many conflicts when synchronizing your offline files in Windows that you have to start over. In my case, I upgraded the file server to a new host and some clients were left with duplicate entries in their Sync Center.
DISCLAIMER: Always create a restore point before editing the registry! If you render your computer inoperable because of modifying your registry then you will have a better chance of recovery.
If you’re not comfortable using the registry editor, you can try using Microsoft’s Fix It tool from KB942974.
Make sure that your files and folder have been synchronized. Reinitializing the cache prior to synchronizing will cause you to lose any data that isn’t synchronized.
Click Start, type regedit in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
Locate the following registry subkey, and then right-click it: HKEY_LOCAL_MACHINESystemCurrentControlSetServicesCSC
Point to New, and then click Key. NOTE: If you already have a Parameters key here, then skip this step
Type Parameters in the box.
Right-click Parameters, point to New, and then click DWORD (32-bit)Value. NOTE: Be sure to select the 32-bit DWORD. If you create a 64-bit value, your computer WILL blue screen!
Type FormatDatabase, and then press ENTER.
Right-click FormatDatabase, and then click Modify.
In the Value data box, type 1, and then click OK.
Exit Registry Editor, and then restart the computer.
You can also copy and paste the contents below into Notepad and save it as a .reg file. Then double-click the file to import it into your registry: