How to remove bad odors?

[Kristi Harmon]

I'm buying an old house that has unpleasant smells. All the carpets are ripped out and the old wood subfloors are exposed (i suspect that is where the majority of the smell comes from). I wonder if I should use odor sealing paint, cleaner or lay something on the floor before installing carpets and vinyl flooring? I will be priming the walls as well with kiltz odor eliminating primer. Let me know what would be a good solution!