Hi megaD,
If you open a terminal
Applications > Accessories > Terminal
and run
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sudo grub-update
it will remove any entries that are not valid. Keep in mind that it is normal to have more than 1 kernel listed in the grub menu that way if a new kernel doesn't work right you still have the next oldest one that you can boot to.
At the end of the timeout, the default entry determined in /etc/default/grub will be selected.
So if you want it to default to windows that is where you would change it. Use this command to edit it
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gksu gedit /etc/default/grub
If the default option is set to "saved", the last kernel/system successfully booted will be selected and run if no input is made.
You can find a lot of info. about grub 2 and how to change things here:
The Grub 2 Guide 
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