Sauté garlic in 1 tablespoon butter in a large skillet over medium heat. Stir in shredded ham and peas, and sauté for 3 to 5 minutes. Remove from heat; cover and keep warm.
Meanwhile, cook fettuccine according to package direction, omitting salt. Drain well; place in a large serving bowl. Add ½ cup softened butter, stirring until completely melted. Add Parmesan cheese and sour cream, stirring gently to coat well.
Fold ham mixture into fettuccine mixture. Add pepper and toss gently.