[Windows] Can not unistall and boot to Ubuntu.

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http://ubuntuforums.org – Hello,few months ago I have encountered a problem. Currently I am running Windows XP alongside with Linux Ubuntu 12.10. The issue I am having is that I just can not boot my PC to Ubuntu OS, because the menu where you choose OS you want to boot is missing. Since I did not have something important in my Ubuntu file system I decided to unistal it in Windows add remove programs menu, but no luck. I receive error message and a log with the cause of the problem. Its is really important for me to remove Ubuntu because after the issues with it for some reason my C: drive is always almost full even tho (Hardware)