Can't install Ubuntu because I don't have enough free space

Can't install Ubuntu because I don't have enough free space

This is my first post and my first day using any Linux-based operating
system. Two days ago I dropped my HP Windows 8 laptop. I got the error:
Boot device not found. Please install an operating system on your hard
disk. Hard disk (3f0).
I couldn't access any files or the OS, so I went on my sister's computer,
researched and learned about Ubuntu. I saved Ubuntu 12.04.3 LTS to a disk
and loaded it, but when I tried to install it, I had it connected to the
power adaptor and the wifi, however there was not enough free space to
install it. How do I view and delete files from the Try Ubuntu without
installing mode?
TLDR - Is there a way to delete previous files if I can't dual boot, using
the "uninstalled version" of Ubuntu 12.04.3?