Time Machine restore option

Hi all,
I am having an issue with Time Machine and was wondering if anyone had a little advice for me on it. Time Machine appears to be running as it should in regard to completing backups, but when I go into time machine the RESTORE option does not appear available and is not an active button. Any ideas as not much point it backing up if I cannot restore from it.

beagle

Restore

For file restore, you need to highlight a file and the restore button will go active
for a complete system restore, you do it from your install discs and restore from a time machine backup
see article Mac 101: Time Machine
cheers