Place paprika in a large nonstick skillet over medium-high heat; cook 2 minutes or until fragrant, stirring constantly. Remove from pan, and set aside.
Heat oil in same pan over medium-high heat. Add beef; cook 3 minutes or until browned, stirring occasionally. Add mushrooms, bell pepper, and onion; sauté 4 minutes. Add toasted paprika, red wine, tomato sauce, and salt. Reduce heat to medium, and cook 6 minutes, stirring frequently.
Combine beef broth, water, and flour, stirring with a whisk until smooth. Reduce heat to medium-low. Add flour mixture to pan; cover and cook 1 hour and 30 minutes or until slightly thick and beef is tender, stirring occasionally.
About 15 minutes before beef mixture is done, cook pasta according to package directions, omitting salt and fat. Stir sour cream into beef mixture. Serve beef mixture over hot pasta.