Below is a list of fixes for this error. You may not need to follow all of them to resolve the issue. If you are receiving a specific error or message, search our knowledgebase for instructions on how to resolve that particular error.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 in the Windows Search section.

On Next Screen, click on Computer icon. (Windows will run a search in your computer).

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.

Click Details.

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.

Open QuickBooks.

Download the update again.

Verify your Internet Connection and QuickBooks settings.Configure your firewall or anti-virus to ensure QuickBooks files have both incoming and outgoing Internet access.Fix Microsoft Cryptographic Services that have been damaged or compromised.Microsoft website has a tool that frequently fixes these problems. (It is a quick and easy fix.)