Trying to install Ubuntu mods Studio and Xubuntu 12.04.1

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http://askubuntu.com – I'm trying to install Ubuntu Studio 12.04.1 (not 12.04) and also Xubuntu 12.04.1 using an USB flash drive but when I boot I always get the following error: invalid or corrupt image I already tried all solutions such as checking MD5, redownloading both ISOs, changing "isolinux" to "syslinux", etc. I think there's something wrong with this version 12.04.>1< cause I tried to install the normal Ubuntu 12.04 and it works fine. What could be? (HowTos)