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When the user tries to install updates from the Windows Update website or the Microsoft Update website, he or she may receive the following error message:


This problem occurs when the Windows Update Agent’s Wups2.dll file is incorrectly saved to the registry. Since the registry files corresponding to the Wups2.dll file are missing, the update installations fail.

The Windows update agent could not be updated because regsvr32.exe returned an error. The error may indicate that the security software installed is incompatible with updating the Windows Update Agent (WUA) or that malware is present.

How to Repair the Windows Update Files.

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1. go to Start > Run.
2. In the REGSVR32 field, enter WUAPI.DLL > Entry.
3. The message “DllRegisterServer in WUAPI.DLL successful” > OK appears.
4. It is now necessary to repeat these steps for each of the following file commands:
Press Enter after each line.


Once the process is complete, because the temporary Windows Update folder may be damaged, do the following to rename the folder:

Select Start > Run > in the cmd > Enter field.

Type the following command in the open window.

Stopping the WuAuServ network

(Note: The computer may need to be restarted before the network shutdown command works.)

Go to Start > Run > Type %windir% > Enter the field.
Rename the folder of the open folder (“SoftwareDistribution”) to “Sdold” by right-clicking.
Go to Start > Run > Type cmd > Enter. Please enter the following in the open command window:

Starting the WuAuServ network

Once you have done this, go to Start > All Programs > Windows Updates and check if it allows you to download/install Windows updates.

Check BITS

restart BITS

There may be a problem with the BITS, so try saving the following system files:

On Windows XP, go to the Run entry in the Start menu and enter the following:

On Windows Vista, go to the Start Search area in the Start menu and type the following:

regsvr32 sqmgr.dll

regsvr32 sqmgrgrprxy.dll

These files are associated with the Windows Update Service.

Qmgr.dll – This file is the Background Intelligent Transfer Service.

Qmgrprxy.dll- This file is the proxy for the background of the intelligent transfer service.

BITS is a background file transfer mechanism and queue manager. Requests are addressed to BITS and files can be transferred in a limited way so that the user is not affected by the bandwidth used. Requests are kept even after disconnection and the computer restarts until the files are transferred. At this point, the requesting program is called and informed of the completion of the transfer. This function allows low-priority downloads to be made in the background without affecting the user’s bandwidth. BITS is a background component and has no user interface and cannot be uninstalled either. This component is part of the automatic update of Windows.

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