users guide is another folder but maybe you have delete them. One guide is over 2M and we have more than 15 of them in there. I deleted them all so I can't tell you how much memory I have saved.

One more step: Go to Settings -> App mgr -> show installed app
and delete apps you don't use often or never use at all (games maybe?)
.
One more thing: always watch your memory: settings -> control panel -> memory
before installing software.