Hi Jay
Those directories contain the Backup Files for Service Pack and Hotfix
installations, in case you ever want to uninstall Hotfixes and/or Service
Packs. Basically, the can be safely deleted, altlhough it's not recommended
with disk space getting cheaper and cheaper those days.
If you are not on really low disk space I don't recommend that you do it. Be
sure to clean all your temp files first and see if you still don't have
enough free space.
Hope this helps. Regards,
Fabio