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I have this weird problem with my SanDisk USB Cruzer maybe someone can help me...

  1. I removed U3 software
  2. I used diskpart.exe to "activate" my partition

yet when I restart my computer and select to boot off of USB it won't boot, my computer freezes and nothing is happening after that.

any ideas what am I doing wrong?

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What have you done to make it bootable? – MDMarra Jun 11 '10 at 19:44
i've used diskpart.exe – alexus Jun 12 '10 at 20:37
up vote 1 down vote accepted

Setting a partition to active is not enough to boot from it. You also need a bootloader installed to the MBR (aka sector 0) of the device. The bootloader is the code that tells the computer how to boot an operating system.

More than likely, your system "freezes" because you told it to boot from the device and there's no code there for it to boot from. Please see the earlier question "Install Win7 from USB" for how to make a Win7 install thumbdrive.

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I would use WinToFlash (as I use it always). Always worked, clickety-click, really easy to use.

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