Error installing ubuntu into my machine

[mahesh]

I'm not very tech savvy. I was trying to install ubuntu because my laptop is extremely slow and I couldn't really work on it as it was. So i followed the ubuntu installation tutorial and used a usb drive to install the os. During installation I got the error:
"The attempt to mount a file system with type vfat in SSI1(0,0,0),partition#1(sda)at/boot/efi failed"
If I continue, the installation stalls, if I restart the computer I get stuck in what I think is called a "BIOS".
I tried to follow the answers in this thread: https://askubuntu.com/questions/5023...-partition1sda

but I couldn't really follow them through because I don't understand the steps. If someone could help me through each step I need to tak to solve this problem I would be immensely grateful. Thank you very much.