In SCCM is possible that the WDS-Files for PXE-Boot sometimes after reboot goes wrong in the registration. You can see the pending Files for Reboot in Registry:
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager, on "PendingFileRenameOperations" Key
Delete this Key and click in the FEP-prerequire-checker back, then go next and run Checker again, now it should be ready for install
have fun, no warranties
and one Info more FEP uninstalls older AntiVirus Engines 
http://technet.microsoft.com/en-us/library/ff823842.aspx
- Symantec Endpoint Protection version 11
- Symantec Corporate Edition version 10
- McAfee VirusScan Enterprise version 8.5 and version 8.7
- Trend Micro OfficeScan version 8.0 and version 10.0
- Forefront Client Security version 1 including the Operations Manager agent
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