I want to learn how to read sheet music, but it can be a bit daunting at first...

Is there computer software out there that exists to help me?

p.s. what are the best software programmes for guitar?

^ go with this, it is easy to see the relationship between tab and sheet music and should help you progress.
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dont use gp5 or tuxguitar, get a basic guitar book
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My bad.

I assumed you wanted to learn how to sight read, and already could read it slowly.

If you cant, go with a basic guitar book as Toast1337 says.