Microsoft Corp. claims in a federal lawsuit that Urbandale-based Dymin Systems Inc. has installed bootlegged copies of Microsoft's Vista operating system on computers. In a lawsuit filed Thursday in U.S. District Court in Des Moines, Microsoft accuses Dymin of violating copyrights and asks for all profits Dymin earned while advertising computers that came with the Vista system installed. Microsoft claims that Dymin used counterfeit copies of the operating system, which was first introduced in 2006, on computers it sold. When Vista was first introduced, it was praised for enhanced security systems and criticized for its stringent licensing requirements. Microsoft said investigators twice bought computers from Dymin that contained illegal copies of Vista. The company said one of the computers was purchased after it asked the Urbandale company to stop selling computers with pre-installed copies of the Vista system.