if backup are deleted and want to remove from unistall

Click Start and choose Run in the menu (If you're using Windows Vista then press Win+R on your keyboard).
Type regedit and hit Enter.

On the left side is the registry settings tree, use it to go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

Inside that key you'll find a lot of keys that belong to different programs. Some are named after the program's name, others as a mix of numbers and letters that makes no sense. Look through each of them until you find one that has the key DisplayName (on the right) with your program's name in it.
Notice the key UninstallString - this key points to the uninstall program, and the log file usually resides in the same folder as that program.

If you delete the key in which you've found the DisplayName key with the value equal to your program's name, then your program won't appear on the Add/Remove programs list.

Some programs create new entries in the registry to store their configuration options, these entries can usually be found in the HKEY_CURRENT_USER\Software or in HKEY_LOCAL_MACHINE\SOFTWARE - look for the program name or the name of the company that made the software. Don't delete Microsoft though - that contains Windows settings as well.