[ubuntu] Accidently installed Ubuntu onto Windows

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http://ubuntuforums.org – So the other day i tried installing Ubuntu onto a SSD via Pen Drive Linux Universal Installer. I created it and put it onto the SSD and put it back into my laptop and when i booted it up it said 'BOOTMGR is missing'. I restarted my dekstop and it turned out i accidently installed Ubuntu onto my Windows and i cannot access it via dual-boot but i can access my file. How can i uninstall Ubuntu from here and no i dont own a recovery disk for windows. Please help Thanks (Hardware)