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Is it necessary to reformat a system after a mobo/cpu upgrade?

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The following procedure works well, for cleaning out any "hidden drivers" remaining after a successful WinXP motherboard swap.
[Changing the IDE controller first, to a "Standard IDE controller" is a good idea.]
A copy and paste, from this thread:
Text

>>>>>>>>>>>>>>>>>>>>>>>>>>>>
FROM MICROSOFT
>>>>>>>>>>>>>>>>>>>>>>>>>>>>
"In order to resolve the issue more efficiently, this case has been escalated to our Windows Platform team. I have taken ownership of your Service Request. From now on, I will work closely with you to resolve this issue. I appreciate the time and effort you have taken on this service request. For your reference, the Case ID of this service request is: (Number Removed for privacy reasons)

"After reviewing the entire service case log, I suggest we try the following steps to troubleshoot the issue:

"Step I: Uninstall Hidden Driver
=====================
"Set Device Manager up to show Non-Present devices and delete the hidden device.

"1. Please click "Start" menu => click "Run" => type "cmd" <without quotation marks> and click "OK"

"2. Please type "set DEVMGR_SHOW_NONPRESENT_DEVICES=1" <without quotation marks> in the command prompt.

"3. Please type "start devmgmt.msc" to launch "Device Manager".

"4. Please click "View" menu in "Device Manager" and choose "Show hidden device".

"5. Please expand all items in the panel, if any hidden device listed below, please delete them. (The hidden device is shown in a transparent color.)

"6. Please right-click the hidden devices and click "Uninstall".
 
The "show hidden" environment variable may as well be added from the system properties -> Advanced tab. Before learning about this I used to go through the tedious process of removing 'em from the Add/Remove Hardware Wizard whos duplicate hidden devices are not distingished from present. Anyhoo, it's a top tip and really oughta be enabled by default, at least when "show hidden" is selected from Device Manager, instead of just showing Non-PnP.
 
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