All the K-Lite pack does is install DirectShow filters, this can't do any harm that can't be remedied by changing the filters/splitters merits. PowerDVD does use DirectShow but it only uses its choice of splitters/filters/renderer, it's possible to load further DShow filters, but the only one of these the K-lite pack contains is ffdshow; and the OP would have had to set it to do so and he ahsn't done so as otherwise DXVA wouldn't have been working.
So it's just not relevant.