error during windows 7 sp1 installation

From time to time some friends call with mysterious problems….  they describe it like “PC is broken”, “it does nothing”

When I got the PC he could not even boot. First I thought some internal peripherals is the problem. Like broken/loose RAM, loose PCI Cards,…. but even after disconnect all internal cards, disks, usb card reader stuff it wont work.
The problem did not solve, it changed the symptoms. (cmos battery error, do nothing,…)

Solution: the motherboard wiring to  the front panel was wrong -.-

Now the system works fine, one little stumbling block thru set bios-defaults, AHCI configuration was gone. Go to BIOS – storage configuration – change IDE to AHCI otherwise Windows won’t boot.

This was the fast part, now the time consuming one….

Installed System: Windows 7 32bit Home

Windows 7 without Service Pack 1 (release date 16. 02.2011) and I thought it is time to solve the problem its summer 2016!
First I tried to install the downloaded SP 1 which ends in the same error like from Windows Update –> ERROR_TRANSACTIONAL_CONFLICT(0x80071a90)
thru this error and a little search I found this Microsoft Article how to perform a clean boot in Windows.
This solves the conflict and reveals a new error..
So once again SP1 –> ERROR_NOT_FOUND 0x80070490
sfc /scannow  –> did not find any problem.
System Update Readiness Tool for Windows 7 –> did not find any problem.
before I give up the solution is found here.

Locate the File:

Search for “Failed to find driver update” copy the Full Path

!!   sto: Failed to find driver update 'C:\Windows\WinSxS\amd64_usbvideo.inf_31bf3856ad364e35_6.1.7600.16543_none_8a1a2513d42628c3\usbvideo.inf' in Driver Store. Error = 0x00000490

Section end 2011/04/14 17:13:38.216

[Exit status: FAILURE(0x00000490)]

run the pnputil.exe command with switch -a
pnputil.exe -a [Full Path to inf]

Untrusted publisher dialog box

Click on “Install this driver software anyway”. Perform this for all drivers with this error.

C:\Windows>pnputil.exe -a C:\Windows\WinSxS\amd64_usbvideo.inf_31bf3856ad364e35_6.1.7600.16543_none_8a1a2513d42628c3\usbvideo.inf

Microsoft PnP Utility

Processing inf :   usbvideo.inf

Driver package added successfully.

Published name :   oem32.inf

Total attempted:              1

Number successfully imported: 1

SP 1 task accomplished… now lets check Windows Update…. > 200 Updates… Yeay!