They made it easy to reinitialize your offline file cache in XP – not so much in Vista. Here’s how:

1. Click Start, type regedit in the Start Search box, and then click regedit in the Programs list. If you are prompted for an administrator password or confirmation, type your password or click Continue.
2. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Csc\Parameters

Note: If the Parameters subkey does not exist, create it. To do this, follow
these steps:

a. Click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Csc
b. On the Edit menu, point to New, and then click Key.
c. Type Parameters, and then press ENTER.

3. On the Edit menu, point to New, and then click DWORD Value.
4. Type FormatDatabase, and then press ENTER.
5. On the Edit menu, click Modify.
6. Type 1 in the Value data box, and then click OK.
7. Exit Registry Editor, and then restart the computer.