Install a digital signature certificate.
Do a Windows Search for QBW32.exe, which is located in C:\Program Files\Intuit\QuickBooks.
To search for QBW32.EXE in Windows 7:
If QBW32.EXE does not come up during initial search, click the link for More Results.
On Next Screen, click Computer on lower right left side at the bottom of the page.
From search results, findQBW32.EXE that has a Type of Application.
Right-click QBW32.exe, and select Properties.
Click the Digital Signature tab, and ensure Intuit, Inc. is selected in the signature list.
In the Digital Signature Details window, click View Certificate.
In the Certificate window, click Install Certificate.
Clicking Next until Finish is displayed. Then click Finish.
Restart the computer.
Download the update again.