As Leenia said create a score from my PC doesn't tell us your needs.

Also, low cost is different.

That said, assuming all you need is a way to input notes on a stave, and guitar chords, and then print it, along with MIDI input and output, you might try one of the Finale products. The FREE Notepad is certainly inexpensive enough, but does not give you MIDI. I use the next one up, the Notepad Plus, which seems to have been renamed Finale SongWriter. This product is 49.95 US$. You can get further details on the entire Finale Product line at Product Overview

Hope one of these suggestions helps.