H&R Block error codes: what each one means

How H&R Block error codes are numbered

H&R Block error codes do not come from one list. A four-digit number between 1100 and 1900 shown while installing or updating is almost always a Windows Installer message, defined by Microsoft and shared by every program that installs on Windows. H&R Block has help articles for some of them, but the underlying cause is in Windows.

Other messages are H&R Block's own words, such as the Mac read-only volume message, and a few short numbers that people report, like 107, 110 and 134, appear without any published explanation. Knowing which group your code belongs to tells you whether to look in Windows or contact H&R Block.

H&R Block error code table

The table lists only codes with a published explanation from H&R Block or Microsoft. The meaning column paraphrases the source named in the last column.

Install-time Windows errors and their fixes

H&R Block error 1152: clear the Temp folder

H&R Block says error 1152 points to faulty temporary files. Its fix is to open File Explorer (Windows key + E), go to C:, then Users, then your user name, then AppData, then Local, then Temp, select the files there and delete them. AppData is hidden by default, so turn on Hidden items on the View tab first. Close the installer before you start, and skip any file Windows says is in use.

H&R Block error 1500: another install is running

Microsoft's Windows Installer list defines 1500 as another installation being in progress. In practice that is often Windows Update or a second copy of the H&R Block installer. Let Windows Update finish, restart the computer, then run the H&R Block installer once. H&R Block separately warns that unfinished Windows updates cause install failures, which is the same root cause.

Error 1721 and error 1722

For 1721, H&R Block tells you to unregister and then re-register the Windows Installer service with the msiexec command in the Run box (Windows key + R), restart, and install again. Error 1722 is a close relative in Microsoft's list: a program launched during setup did not finish. It has its own page, H&R Block error 1722, because the causes differ.

Mac messages

The read-only volume message means the app did not install properly. H&R Block's fix is to drag the H&R Block 2025 app to the Trash, reopen the installer from the desktop, drag the green H&R Block icon into Applications and launch it from there. A DOS mode message on a Mac means the Windows installer was downloaded by mistake; H&R Block asks you to contact support for the Mac version. More install causes are in H&R Block software not installing.

H&R Block error code 110, 107 and 134

As of 18 September 2026 we could not find an H&R Block help article explaining error code 110, 107 or 134, and none of them is a Windows Installer code. Rather than guess at a meaning, record where the code appeared and treat it by stage.

• During install or update: run through the install checks (administrator rights, antivirus paused, default C: location, Windows updates finished) and retry once.
• While opening a saved return: copy the file somewhere safe and see H&R Block failed to open database for file-level problems.
• While e-filing or updating: check your internet connection and whether a firewall is blocking the program; an update that stalls is covered in H&R Block software won't update.
• Anywhere else: take a screenshot and contact H&R Block through the support page on hrblock.com.

Where to look up H&R Block error codes and when to contact support

Search H&R Block's help center at hrblock.com/tax-center/support for the exact code first. For a four-digit installer code with no H&R Block article, Microsoft's Windows Installer Error Messages page gives the official wording, which helps you judge whether the problem is Windows or the tax program.

Contact H&R Block when a documented fix has failed, when a Mac shows the DOS mode message, or when a code appears after your return is already prepared. Give them the product and year, the code, the screen it appeared on and what you already tried. For every other symptom, start at H&R Block not working.