[windows] `uru gem up <gem>...` failure

On Win7 32bit after getting a listing of outdated gems via

C:\>uru gem out
jruby 1.7.4 (1.9.3p392) 2013-05-16 2390d3b on Java HotSpot(TM) Client VM 1.7.0_25-b16 +indy [Windows 7-x86]

addressable (2.3.4 < 2.3.5)
atomic (1.1.9 < 1.1.10)
bcrypt-ruby (3.0.1 < 3.1.0)
jquery-rails (3.0.1 < 3.0.2)
kramdown (1.0.2 < 1.1.0)
minitest (5.0.5 < 5.0.6)
sequel (3.48.0 < 4.0.0)

ruby 1.9.3p448 (2013-06-27 revision 41673) [i386-mingw32]

net-ssh (2.6.7 < 2.6.8)

ruby 2.0.0p255 (2013-07-07 revision 41812) [i386-mingw32]

bigdecimal (1.2.0 < 1.2.1)
minitest (5.0.5 < 5.0.6)

ruby 2.0.0p255 (2013-07-07 revision 41812) [i386-mingw32]

the uru gem up command falls down like

C:\>uru gem up addressable net-ssh minitest
jruby 1.7.4 (1.9.3p392) 2013-05-16 2390d3b on Java HotSpot(TM) Client VM 1.7.0_25-b16 +indy [Windows 7-x86]

---> unable to run `gem up addressable net-ssh minitest`

--- returned error message ---
exit status 1

--- combined child output ---
Updating installed gems
Updating addressable
ERROR:  While executing gem ... (Errno::EIO)
    Input/output error - C:\

ruby 1.9.3p448 (2013-06-27 revision 41673) [i386-mingw32]

---> unable to run `gem up addressable net-ssh minitest`

--- returned error message ---
exit status 1

--- combined child output ---
ERROR:  While executing gem ... (Errno::ENOENT)
    No such file or directory -
Updating installed gems
Updating net-ssh

ruby 2.0.0p255 (2013-07-07 revision 41812) [i386-mingw32]

---> unable to run `gem up addressable net-ssh minitest`

--- returned error message ---
exit status 1

--- combined child output ---
ERROR:  While executing gem ... (Errno::ENOENT)
    No such file or directory -
Updating installed gems
Updating minitest

ruby 2.0.0p255 (2013-07-07 revision 41812) [i386-mingw32]

Updating installed gems
Nothing to update

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