Step 1Fry bacon in skillet over medium heat until crisp, 8 to 10 minutes. Drain on paper towels and blot dry. Crumble and set aside.
Step 2Place spinach, oil, balsamic and red wine vinegars, 1/4 teaspoon salt and pepper to taste in large shallow bowl. Set aside.
Step 3Cook pasta according to package directions until al dente. Reserve 1 cup cooking liquid; drain pasta, put in reserved bowl with spinach mixture. Toss several times until well mixed, adding cooking liquid if mixture is too dry. Taste and adjust seasoning.
Step 4To serve, divide between 2 plates; garnish with bacon and cheese. Serve hot or warm.