Microsoft is disputing an attempt to reinstate class-action status to an ongoing lawsuit against its Windows Vista Capable sticker program, a case that threatens to drag on and is reflective of the difficulties Microsoft has encountered by releasing its disappointing Windows Vista OS. In court papers filed in a U.S. District Court in Seattle, Microsoft asked the court not to reconsider applying class-action status to the suit because people knew exactly which version of Vista they would receive through a coupon program called Express Upgrade Guarantee.