Answers: Yes, you can.
After inserting the OS X 10.5 Leopard DVD you will be asked in the region of which drive you want to install the system on. This is where on earth you must pick which style to install the system:
1. Upgrade
2. Erase and install
3. Archive and install
Upgrading will upgrade to the trial system, and your files will still be ok. This would usually be a perfect choice, but it have be set to incentive disorganized problems.
Erase and install will delete everything and reinstall the system.
Archive and install will put all your files in a single .dmg file and re-install the system. Once it is done you will a short time ago own to bear adjectives your files out of the .dmg file and put them where on earth they used to be. This is recommended, as it almost never have any errors. It of late requires a bit more work because you hold to re-organise your hoary files.
Hope this help!
Yes it is
but i one-time lol