As opposed to deleting the unwanted items in your Start Menu Programs
listing, try simply hiding them. This way if you ever need to add them
back, all you have to do is unhide them using Windows Explorer.

To hide the items, simply right click on the group listing in your
Start Menu and select Properties. Check the Hidden box and then Apply.
When prompted, apply the settings to all subfolders and files. Now
when you go to your Start Menu Programs, the group will not display,
but it is still available in case you ever want to display it again.