I just updated my Ubuntu linux version but after I did, I get 2 different ubuntu options on my boot menu? Why?

Hi I just updated Ubuntu 10.04 and after the update, the system works fine, even better actually than it used to and all my files and settings are still in order but there is one problem. Before the update, when I turned on my computer, I used to get a boot screen showing some 5 options, and the first one being something like "Ubuntu with Linux 2.6.32.21 generic", the natural option for loading the system. Below it would be the same option but with recovery mode. The last 3 options have nothing to do with booting the system, just some memory checking options and one windows 7 boot option. Anyways, after the update, the first two options didn't disappear and the updated system and information didn't replace these as I would have expected. Instead, 2 new options were made for the new updated Ubuntu 10.04 system right at the top, in exactly the same form but it is now "Ubuntu with Linux 2.6.32.24 generic" instead of ".21 generic" at the end and there is also a recovery mode option and eveything. For now, this does not affect anything and I can simply load the newer version but for the future, it might become very unelegant, having about a 100 options on my boot menu. Does anyone know how to fix this? Any help is appreciated. Thanks a lot.