Last week I took the plunge to install Windows 7 RTM on my laptop. I ran into this crazy problem with BootMgr. Read about it here!
http://blogs.techrepublic.com.com/networking/?p=1842
Read the complete post at http://owsug.ca/blogs/brad/archive/2009/08/18/BootMgr-issue-when-installing-Windows-7-RTM-with-Server-2008-in-Multi_2D00_Boot.aspx