I need to install Windows but I don't have an 8 GB USB. Is there any way to switch to Windows without USB?
If your computer has a built-in CD slot, you can put the Windows ISO onto a CD
No, I don't have any CD slot
How about a CD reader that you connect to your computer using a USB port?
No, I don't have that too.
I guess you need to buy a USB
Partition your drive to have about 15gb in a fat32 partition. Install the live image to that partition. Boot to the live image and reinstall to include windows or as windows completely. Boot into windows and delete/ merge the 15gb partition.