Download the Ubuntu iso here according to your system:Use Ubuntu's way of creating the USB Bootable Image or DVD Bootable Image (both are the same)USB method for windows:DVD method for windows:Once you have that change your boot sequence in your bios (start your computer wait for the bios screen to prompt and press the button accordingly) choose to either boot from usb or dvd but usually dvd is the default boot deviceChoose to replace Windows 7 with ubuntu and follow the setup!(your installer may not look like this) I.
Hp Mini 110 Windows Xp Install Disk
HP Mini 110-3014tu Driver Download For Windows XP, Vista & Windows 7 HP Mini 110-3014tu Specification: Intel Atom processor N475 (1.83 GHz, Cache 512 KB), Chipset Intel NM10, 1GB DDR2 SODIMM PC-8500 (Max. Download and Install the Latest Version of the HP Mini 110 Drivers Windows XP Audio, BIOS, Network, VGA, Firmware and Software.