Last versions of Windows applications that do not require SSE2

This page lists the last versions of certain Windows applications that do not require a processor with support for SSE2. Examples of such processors are the AMD Athlon XP and Intel Pentium III.

Such applications usually crash suddenly and reproducibly on startup or when you attempt to use functionality that requires SSE2 (Blender and VLC are examples of those). A definitive sign is the following error message:

The application failed to initialize properly (0xc000001d). Click on OK to terminate the application.

Perhaps the biggest reason why later versions of these applications require SSE2 is because Visual Studio 2012 and later automatically compile code for SSE2 processors, so many developers are not even aware of it.

It is assumed that you are using Windows XP. (The last version of Windows to not require SSE2 is Windows 7, but Windows XP is probably a better choice for such computers.)

Note: just because an application doesn't require SSE2 doesn't mean that it doesn't require MMX or SSE.

Please check back later as this page is continuously being updated. In the case of open source applications, unofficial versions sometimes appear to restore support for old systems.

EMET4.1 update 1 (This is the last version for Windows XP, regardless of SSE2.)
Git2.10.0 (Just say no. Use Mercurial or something else if you can. This is the last version for Windows XP, regardless of SSE2.)
Kryoflux DTC2.20
Process Explorer15.3?
Processing(The latest version works despite officially requiring Windows 7 or later.)
Python 3.x3.4.3 (The latest in the Python 2.x series, 2.7.14, does not require SSE2.)
QEMU2.7.0 (This is the last version for Windows XP, regardless of SSE2.)

Web browsers that don't require SSE2

There is no single best choice; which browser to use depends on your needs and which sites you visit.

Opera 12

Opera 12.18 (released in February 2016) is fast, lightweight, customizable, and probably quite secure. If you use it, please read my Opera 12 security and privacy guide. However, some sites that require JavaScript are not compatible with it. For those sites, I recommend using a Gecko-based browser.

Gecko-based browsers

For better security and performance, install the NoScript extension to disable JavaScript by default. (For better privacy, also install Privacy Badger, HTTPS Everywhere, and an advertisement blocker of your choice.)


The last official version of SeaMonkey that does not require SSE2 is 2.40 from March 2016.

There exists an unofficial version 2.48 without SSE2 from May 2017 (more information). To install it, open the installer with e.g. WinRAR and extract the "core" folder from there, or download my zip archive and extract that.


The last extended support release of Firefox without SSE2 is 45.9.0ESR from April 2017. It is newer than version 49, which was the first regular release that required SSE2.

Firefox is the slowest of all browsers on this page.

Pale Moon

The last unofficial version of Pale Moon for Windows XP and processors without SSE2 ("Pale Moon SSE") is 26.5.0 from October 2016.

Internet Explorer 8

I don't recommend Internet Explorer except for sites that require it, but if you are using the unofficial registry setting to get updates for Windows XP after April 2014, you will still get security updates for it. If possible, you should disable SSL 2.0 and 3.0, enable TLS 1.0, disable JavaScript, and disable or uninstall all plug-ins and add-ons.

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