Dual boot question

I have a dual boot on my laptop, and when I turn my computer on, it has 4 previous versions on it with the Windows 7. How do I remove the previous versions of ubuntu? I know I need to keep the most current previous version as well as the current version but it is filling up the boot screen and I would like them removed. Any help would be most appreciated

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Dual Boot

Go to Applications>System Tools>Ubuntu Tweak.
Choose "Package Cleaner"
Unlock by adding your PW.
Down the right of the screen you'll see, amongst others, "Clean Kernels", choose it.
Tick those you wish to "clean" then hit "Cleanup".