How do i do a full system restore on a Dell optiplex gx50?

I have a dell Optiplex Gx50 computer and i really need to do a full System restore back down to factory settings, but i can find how to do it on the computer itself and i do not have the restore disks, how can i do it?How do i do a full system restore on a Dell optiplex gx50?recover to factory settings press F8 at start up (vista)

for xp

When the Dell splash screen appears during the computer startup process, press and hold %26lt;Ctrl%26gt; and then press %26lt;F11%26gt;. Then, release both keys at the same time.

NOTE: Some systems like Inspiron Mini 9 (910) do not support System Restore as they do not have %26lt;F11%26gt; nor any substitute.How do i do a full system restore on a Dell optiplex gx50?go to start

type in system restore

it should come up

click on it follow directions