Actually you can use windows 7 bootloader to load other operating systems.In windows press win+R to bring up the run dialog then type msconfig under the boot tab this is where you edit the boot options now editing this depends on what your trying to load however in most cases just recreate the windows entry but change the boot path to your os ubuntu webui automates this its how i know it works try that for a example but be carefull if you screw up you windows bootloader your in for a headache