Failing tests on win/jenkins
This across all bits/pythons:

pandas.tests.test_indexing.TestIndexing.test_astype_assignment  16 ms   3

``` python
Error Message

attr is not equal [dtype]: dtype('int32') != dtype('int64')

Stacktrace

Traceback (most recent call last):
  File "c:\Python26-AMD64\Lib\unittest.py", line 279, in run
    testMethod()
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\tests\test_indexing.py", line 1387, in test_astype_assignment
    assert_frame_equal(df,expected)
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\util\testing.py", line 493, in assert_frame_equal
    check_less_precise=check_less_precise)
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\util\testing.py", line 441, in assert_series_equal
    assert_attr_equal('dtype', left, right)
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\util\testing.py", line 425, in assert_attr_equal
    assert_equal(left_attr,right_attr,"attr is not equal [{0}]" .format(attr))
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\util\testing.py", line 408, in assert_equal
    assert a == b, "%s: %r != %r" % (msg.format(a,b), a, b)
AssertionError: attr is not equal [dtype]: dtype('int32') != dtype('int64')

```

pandas.tests.test_series.TestSeries.test_where_setitem_invalid

``` python
Error Message

attr is not equal [dtype]: dtype('int32') != dtype('int64')

Stacktrace

Traceback (most recent call last):
  File "c:\Python26-AMD64\Lib\unittest.py", line 279, in run
    testMethod()
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\tests\test_series.py", line 1348, in test_where_setitem_invalid
    assert_series_equal(s, expected)
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\util\testing.py", line 441, in assert_series_equal
    assert_attr_equal('dtype', left, right)
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\util\testing.py", line 425, in assert_attr_equal
    assert_equal(left_attr,right_attr,"attr is not equal [{0}]" .format(attr))
  File "C:\Program Files (x86)\Jenkins\workspace\pandas_tests\BITS\64\PYTHONVER\26\pandas\util\testing.py", line 408, in assert_equal
    assert a == b, "%s: %r != %r" % (msg.format(a,b), a, b)
AssertionError: attr is not equal [dtype]: dtype('int32') != dtype('int64')
```
