MacBook doesn't boot windows 7 (harddisk problem)

hello,
a few weeks ago i replace my original harddrive by a grater one. i reinstalled osx and all looks fine. yesterday i tried to install windows with help of boot camp. i inserted the install dvd and the macbook boots and runs windows 7 setup. at the partition selection dialog there were no partitions at all. after a few reboots i was able to select my bootcamp partition but at the reboot during the windows setup the same problem. a few reboots later the installation has finished. i ejected the windows install dvd and now the black and white windows prompt tells me that there isn't any bootdrive. a few reboots later i was able to run windows and selected windows as the default startup volume in bootcamp. now the macbook shows me a flashing question mark at windows boot.
it feels like a efi driver problem for me. Anybody an idea how to solve this?

Perhaps it's useful to look which process is eating up all CPU time.
From http://www.thexlab.com/faqs/performance.html
To determine if a specific process or application is impacting performance:
Open Activity Monitor (Leopard, Tiger, Panther®) or Process Viewer (Jaguar), >located in the Macintosh HD > Applications > Utilities folder.
In the Show pop-up menu in the toolbar of Activity Monitor or Process Viewer, >assure All Processes is selected.
Sort the list of processes by %CPU in descending order:
In Activity Monitor, click the %CPU column heading until the data in that column >is sorted in descending order.
In Process Viewer, click the %CPU column heading, then click the arrowhead at >the right side of the column headings until the %CPU column is sorted in >descending order.
The process or application using the greatest % CPU is now at the top of the >list.

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