The USB port info is hopefully not relevant.
First backup any data that you wish to keep
On a friend's (Windows probably) computer you need to download a 32 bit
version of the Linux distribution you require (see ardvark71's post above).
Zorin OS 9 Lite
is good on low powered, low RAM machinery (see review below).
This .iso image then needs to be burned
onto a USB flash drive and made bootable
by means of Unetbootin
Any existing data on this USB drive will be wiped!!
Plug the USB drive into your Acer, turn on the netbook and keep tapping the F2
key to access the BIOS screen.
Look for a Tab or section labelled Boot
and locate USB HDD
must be moved to the top of the boot order
by means of the F6
to save and exit.
When the netbook restarts you may need to reconfirm your choice of USB HDD as the boot device. You may need to click on another key (F9?) to reach the Boot Device and make your selection.
Linux should now load.
Wait for a few minutes and then double click on the Install
When you reach the partitioning section, choose Something Else
and create 3 Primary partitions.
Please refer to post #3 for details:
This review features Zorin OS 9 Lite
(based on Ubuntu) on several machines including a netbook similar to your one (Asus 1101HA netbook with Intel Atom 1.38 Ghz processor & 1 GB RAM):