Currently Being ModeratedNov 22, 2013 3:49 PM (in response to cleliodpaula)
If you happen to have a backup copy of OS X Mavericks, you could use CMD+D on startup to fresh install Mavericks there. Although, if your Mac is from Early 2011, you probably still have a grey disk around with Snow Leopard. If you have it, put it in and install Snow Leopard again (since you just want to erase data). Then update to 10.6.8 and download Mavericks once again.
Currently Being ModeratedNov 23, 2013 5:21 AM (in response to xtremecarbon)
When I press CMD+D the MacBook goes straight to automatic repair on windows 8.1.
I'm using an external DVD player trying to re-install lion. In my setup I have two internal HDs:
120SSD that was installed Mavericks
320gb that I installed windows 8.1
Now, I cannot run the utilities from MacBook, or see the option to install by an external DVD player.