Srikanth Asked: booting windows 7 after hibernation fails! pls help!?

Recently, i installed the Windows Developer Preview OS on my laptop alongside my windows 7, but after the installation, i was not able to boot up my windows 7 OS. it showed me an error stating "Windows cannot verify the digital signature for winload.exe". i then tried to do a startup repair, but it didnt work. i also tried using the commands under bootrec.exe (fixboot, fixmbr, and rebuildbcd); although they showed me success messages, it proved to be of no help. then through the windows developer preview os, i went to the windows 7's folder containing winload.exe. there was also another file named winload~1.exe so i renamed and replaced the older file with this one and finally i was able to boot into my windows 7 os. now, two other problems have sprung up. although i could boot into windows 7, the bootscreen had been changed to that of windows vista and i am not able to boot up my computer after it hibernates ( it shows windows was not shut down correctly screen on boot up). i tried to repair the starup again with the windows 7 repair disc, but still no change. please help.

i also tried replacing the winload.exe from another computer, but nothing changed then too.

thanks

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Laptop-
ACER 5738G
WINDOWS 7 HOME PREMIUM sp1
INTEL CORE 2 DUO 2.2GHz
500GB HDD
4GB DDR2 RAM
512 MB ATI DEDICATED GRAPHICS (4570/5100 SERIES)