Disk read error when booting Windows 7 / White screen / Screen frozen

Hello,
I installed Windows 7 and Mac OSx on Dual boot.
1) A problem arose when starting up. Sometimes the screen freezes after i have selected Windows 7 boot on BootCamp.
2) Second problem, when booting the screen is white and doesn't change.
3) Third problem, "Disk read error occured". This is the message that appears on the screen when booting Windows 7.
4) Fourth problem, a blinking folder with a Question Mark on it.
Please help with these problems.
Thank you for your help.
Stinou142

Windows insists that its Partition Map be set up the Windows way. No exceptions. If you use anything other than BOOT CAMP (or Open Source REFIt) to do the partition setup, it will not work.
WARNING: If you allow Windows to Modify the partition Map directly, Windows will clobber Mac OS X so completely that will require a complete Mac OS X Re-Install. Windows in not a pleasant guest.
Be certain you are using the correct version of BOOT CAMP to match Your Mac OS X, and check for which versions of Windows are supported under it.

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