[ubuntu] Unable to boot to installer

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http://ubuntuforums.org – Hi all, I am trying to set up a dual-boot with Windows 7. Steps taken so far: 1) Downloaded 12.04(x64) and created USB install. 2) Altered bios to boot from USB Screen shows:SYSLINUX 4.06 EDD 4.06-pre1 Copyright (c) 1994-2011 H.Peter Anvinet al No valid file system found!3) Restarted and tried changing Linux partition in Windows from unallocated space, RAW, FAT, NTFS, all no luck. 4) Tried using the wubi installer from Windows. This boots into the loader but just shows:Mount is denied because the NTFS volume is already exclusively opened. Could not mount partition /dev/sha1 Run chkd (Hardware)