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test_bufio fails sporadically on the AMD64 Windows7 SP1 buildbot, e.g.:
http://buildbot.python.org/all/builders/AMD64%20Windows7%20SP1%203.x/builds/161/steps/test/logs/stdio
test_nullpat (test.test_bufio.CBufferSizeTest) ... ok
test_primepat (test.test_bufio.CBufferSizeTest) ... ERROR
test_nullpat (test.test_bufio.PyBufferSizeTest) ... ok
test_primepat (test.test_bufio.PyBufferSizeTest) ... ok
======================================================================
ERROR: test_primepat (test.test_bufio.CBufferSizeTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "C:\Users\Buildbot\buildbot.python.org3円.x.kloth-win64\build\lib\test\test_bufio.py", line 59, in test_primepat
 self.drive_one(b"123456789000円01円02円03円04円05円06円")
 File "C:\Users\Buildbot\buildbot.python.org3円.x.kloth-win64\build\lib\test\test_bufio.py", line 52, in drive_one
 self.try_one(teststring)
 File "C:\Users\Buildbot\buildbot.python.org3円.x.kloth-win64\build\lib\test\test_bufio.py", line 20, in try_one
 support.unlink(support.TESTFN)
 File "C:\Users\Buildbot\buildbot.python.org3円.x.kloth-win64\build\lib\test\support.py", line 229, in unlink
 os.unlink(filename)
PermissionError: [Error 5] Access is denied: '@test_2420_tmp'
Is there some kind of anti-virus installed on the machine?

Looks similar to the sporadic test_reprlib failure. Roumen has explained
that here:
http://bugs.python.org/issue14599#msg162727
I didn't test myself though, just a guess.

> Looks similar to the sporadic test_reprlib failure. Roumen has explained
> that here:
I don't think there's anything similar. The path is much smaller in
test_bufio.

I've changed the malware scanner to disable real-time protection and
have disabled scanning of the buildbot directories.
Note that I could reproduce intermittent failures when using '-j' of
regrtest, but with these changes they no longer appear.

> I've changed the malware scanner to disable real-time protection and
> have disabled scanning of the buildbot directories.
Thank you. I hope that, thanks to this change, we later can make the
Win64 buildbot part of the bunch of stable buildbots.

The implementation of test.support.unlink() was changed since. It tries to change permissions of read-only files, and repeat attempts several times. It looks more reliable now. Is this issue still reproducible?

I've not seen this issue on that worker for a very long time; closing the issue.