Upgrade from 2008 R2 to 2012 Rollback but Update Readiness Tool shows no errors

we attempted upgrade windows 2008 r2 server 2012 , server rolled original state error: 

2013-08-09 09:21:05, error      [0x0e00dd] tool   os rollback: requires switch[gle=0x000000b7]

so ran system update readiness tool reports no errors found seems though report error in last line " (w) unable system disk properties 0x0000045d ioctl_storage_query_property disk cache"

i can't find points error indicating. 

=================================
checking system update readiness.
binary version 6.1.7601.21645
package version 19.0
2013-08-09 10:16

checking windows servicing packages

checking package manifests , catalogs

checking package watchlist

checking component watchlist

checking packages

checking component store

summary:
seconds executed: 631
no errors detected
(w) unable system disk properties 0x0000045d ioctl_storage_query_property disk cache

hi jeremy,

thanks inquiry. i'm not sure if steps have worked. ended doing on 1 dc uninstalled iis role running cs web enrollment , on second sever uninstalled management framework 3.0 allowed proceed install. 

Windows Server  >  Setup Deployment