It appears that there are lots of "Ubuntu alongside Windows" posts, but I couldn't find my answer.

My PC's only OS was Windows 7 x64. All of my 750 GB HDD partitions were in NTFS format. Yesterday I made 15 GB of unallocated space to install Ubuntu 11.10 x64. During the installation (installed from USB) I chose "Install Ubuntu alongside Windows 7" option. After that everything goes smooth and installation was successfully completed. Ubuntu asked me to remove the installation media and restart the computer.

After restarting the PC, Windows 7 was loaded. I was expecting an OS selection menu. It appears that Ubuntu didn't change master boot record at all.

Using EASEUS Partition Master Home Edition, I found that Ubuntu made 2 partitions in that 15 GB unallocated spaces (11 GB + 4 GB). So I can assume that Ubuntu did get installed where I wanted it to be installed. But I can't boot to Ubuntu. How can I fix this? I want to have an OS selection menu.

I'm an advanced user of Windows but extremely new in Linux. Please provide enough details so a new user like me understand the process.

P.S. I don't want to use Boot Repair as it isn't officially supported by Canonical.