It is very common to experience muscle aches, including in your legs, when you have a viral cold. To relieve both the leg pain and cold symptoms, you can take paracetamol or ibuprofen, which help reduce pain and fever. For nasal congestion, a generic decongestant like pseudoephedrine can be helpful, or you can use a saline nasal spray. Please ensure you get plenty of rest and stay well-hydrated. If your leg pain is accompanied by swelling, redness, or warmth, or if your cold symptoms do not improve after a week, please consult a doctor for a proper evaluation.