Trouble dual booting ubuntu after installation

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http://askubuntu.com – I just installed ubuntu to my new lenovo thinkpad so it could dual boot with windows 7. I downloaded the iso file from ubuntu and put it onto a flash drive. I restarted my computer, booted from the flash drive and got the standard options (1. try ubuntu 2. install ubuntu 3. check for disc problems). I went ahead and installed it onto my computer, choosing to install with another operating system. Everything about the installation seemed normal. Now, once that installation was complete, it asked me to restart my computer (so I did), and on start up, it loaded windows without even giving me the (HowTos)