Don't know why you're having problems just downloaded both files from above links and works fine.
First save downloads to desktop:
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Rename the PMagic ISO file to pmagic_2011_11_24
Run the UNetbootin program
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Select Diskimage and browse to the PMagic ISO on the Desktop
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Click OK and the files will be copied to the USB pendrive
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Once the files have been copied you will get the following screen:
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Click Exit and browse to the pendrive to check the files are all there
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Make sure the USB Pendrive is plugged into the PC and reboot. Press F12 during POST to get the BOOT Menu and select USB-HDD.
It should now load and run PMagic.