You shall upgrade to firmware 7.10 on MSA1000. After cold reboot of MSA1000 (not possible to do remotely) start flash application again and check if the version displayed is 7.10. Then try.
Good that you have just ONE fibre connection from server to MSA1000. Otherwise there is no active-active multipath support driver for MSA1000 and WIndows 2008 R2. HP compatibility web site is not yet updated for 2008 R2 (located here:
http://h20272.www2.hp.com/index.aspx)