long boot times for Win 7 Computers

after deploying SCCM 2012, some users have complained that their boot times for the  Win 7 Computers are extremely long,up to 15min.

it must be SCCM 2012 who causes that issue,what can i do to fix it?
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quickslvrConnect With a Mentor Author Commented:
i have installed a patch for all thosr clients,now its working:

Windows6.1-KB2617858-x86.msu (Hotfix KB2617858)
Check the network settings of the NIC. Do you use Cisco switches? Maybe a long shot, but if so, check if PortFast is enabled.
quickslvrAuthor Commented:
its a setting in the SCCM which i have to disable,not the client
Vinod PawarIT Core Computing AdvisorCommented:
In SCCM2012 first stop client Push and check if client push is making this issue
quickslvrAuthor Commented:
i installed this patch ,now its working:
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