The sse2_winxp app fails immediately (computation error) on my Windows XP computers that have processors that support SSE2, but works on the ones with SSE3. The log shows "Illegal Instruction (0xc000001d) at address 0x004016D4". In the "period__search_10213_windows_intelx86__sse2_winxp.exe" file properties window under the Details tab, the "Original filename" is "Period_search_sse3.exe". The sse2_winxp executable file has the same file size as the sse3_winxp executable file, although the file hash is different.

Despite the delay there is a new version of the SSE2 application for the Windows XP (x86 & x64) with fixed logic which now is using the right SSE2 intrinsic instructions.

You can give it a try and send some feedback.

Georgi

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“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson

Is the new version being sent out by the server yet? The version number on the Applications page of the website is still the same, and I still got the same error when the task started.

The new version is there now, and it appears to be working.