can't access Fedora, dual boot (win7+fedora15). help~

Hello everyone, I'm new in Linux. Given the need of study, I tried making dual boot by installing fedora 15 after Win7 (1st boot). but it doesn't work. it shows "Hard Disk Error". Here is the detail: I have C D E F G H, 6 partitions where Win7 is in the C, with 2 hidden partitions for the backup of system and software (made by operator). I deleted the partition H to make 30GB free space for fedora 15. Then I made USB boot by the DVD image and started the installation. When it came to divide partitions, I gave /boot(sda9) 250MB and swap, /home, / the rest. After it finished, I rebooted, the computer entered directly Win7. Then I used EasyBCD 2.1.1 to add the linux in the boot list by the partition of /boot (sda9). At last, I rebooted again and chose the fedora system, but I failed to access it. There were only three words in the screen "Hard Disk Error". I guessed it may be due to the incorrect MBR, so I tried fixing by the method indicated here (linuxhelp.blogspot.com/2005/11/how-to-repair-corrupt-mbr-and-boot.html). But I didn't success. Well, that's all. I don't know how to do to fix it. Could someone help me please? Thank you

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