LesTaT, I believe you are describing the same problem as the original poster and I experienced. Following CBR's advice, I uninstalled Windows Media Player and then re-installed it. For other reasons, I uninstalled RTW and then reinstalled it, patched it, installed RTR 6.0 and the RTR 6.1 patch. The problem has disappeared.
It is possible that installing RTR 6.1 did the trick, but more likely CBRs solution worked.
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