hi, it assumes you have a disk/dvd/cd where the installer is saved. given the above - you have the following options;
1. mount it on another pc and share the drive folder to your laptop w/out a drive, then start installing
2. us a usb flash disk, copy the installer and plug to your laptop and start installing
3. for both #1&2 you can copy the installer to your laptop's drive and use it to install
4. borrow or buy a usb based dvd/cd drive and use it to install.
5. buy a pluggable dvd/cd drive to permanently install a drive to your laptop or pc so you dont need all of the above when you need to install a software to your computer.

hope this options are enough. good luck.