Thanks everyone for your answers. I did an advanced install at first, and I created an extended partition with logical partitions consisting of space for linux-swap, root (/), /home and boot. During the advanced installation I received an error on the partition where the linux-swap was being installed. So, I got impatient (probably the problem) and restarted the system while it was trying to recover from the error. I deleted all the partitions until they were 'unallocated space', then I did an automatic install. I thought all was well until I tried to boot up Win7.
I think I may have found the solution to the problem though. I just reinstalled Win7 over everything after I backed up my data. Thankfully I was able to pull my data from Win7's NTFS partitions via Ubuntu's file manager. I'll reinstall Ubuntu, but I'm going with 12.04 until 13 is more stable.