Sunbelt TechTips for the week of May

How to restore the system/boot drive letter

Occasionally, if you make a change to the hardware/disk drive configuration, your drive letters may get changed so that the letter that was previously assigned to your system/boot drives (for example, c:) is no longer the same. These instructions assume your C: drive was changed to D: and tell you how to change it back to C: Before you begin, you should back up your data and the system state, and you must be logged on as an administrator. First you may need to change Permissions:

Start Regedt32 and navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices

Click MountedDevices and then click the Security menu.

Select Permissions.

Give Administrators Full Control permissions.

Close Regedt32.

Next you can rename the drives:

Start Regedit (you cannot use Regedt32) and navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices

Find the entry for the original drive letter (in this case, \DosDevices\C:)

Right click it and select Rename.

Rename to a letter that's not being used, such as \DosDevices\Z:

Now find the entry for the changed drive letter (in this case, \DosDevices\D:)

Right click it and select Rename.

Rename it to the original (\DosDevices\C:)

Right click \DosDevices\Z: and rename it to \DosDevices\D:

Close Regedit.

Finally, change the Permissions back:

Follow Steps 1-3 in the first set of instructions.

Set Administrators back to Read Only.

Close Regedt32.

Note: you should use this procedure only if your drive letters were changed from the letter used when you installed XP. Don't change the letter of the system/boot drive otherwise.

How to manage groups in the XP address book

You can use the address book in Windows XP to store contact information that can be utilized by Outlook, Outlook Express, IE, NetMeeting and other Microsoft applications. For a tutorial on how to create and manage groups of names in the address book, see KB article 308668 here.

IE displays a blank white page

You opened a new window in Internet Explorer 6, or click an HTML link to open a new window in IE, and all you get is a blank white page. What's up with that? If you try to do a search on the page, you'll see an error message that says "Error 49: Interface not registered." That's a clue that your problem is unregistered or incorrectly registered DLL files related to Internet Explorer. Luckily you can usually fix the problem by registering the relevant files. To find out how to do so, see KB article 902932 here.

Explorer.exe quits when you try to search for a file

If you try to search for a file in Windows XP and the Explorer.exe process suddenly quits, causing the taskbar to disappear for a moment and the desktop to be redrawn, it just may be that you installed the Windows 2000 Resource Kit on your XP computer and this copied the Rkadmin.dll file to the System32 folder. If that's the case, you can workaround the problem by uninstalling the Resource Kit. For more info on this problem, see KB article 900004 here.