A lot of software these days, even Microsoft applications, can be purchased online and downloaded from the relevant websites, though a fast broadband connection is needed for large applications otherwise it would take several hours and even days.
I'm guessing the laptop doesn't have a built in CD-ROM drive, which is a bit of a handicap these days as all retail software now is on CD-ROM or DVD. However, a 'plug in' external CD-ROM drive is not unusual for laptops which don't have one built-in, usually connected to the laptop via USB. This means any USB CD-ROM drive should work, regardless of who makes it.
Lenovo's own offering is here and it writes to CD also: http://shop.lenovo.c...9D77F5867D31462
If that's more than you wish to spend, you'll find many more if you type 'external cd-rom drives' (without the quotes) on the Google search engine.