Seven have a higher security level than Vista. So, if your UAC it's not turned off, you may have a great chance that installed codecs won't run. On the other hand, MKV, as I've said, usually requiers an AVC decoder, AC3Filter and an MKV splitter to be installed. BSPlayer installs by defauld FFDshow and Haali media splitter. I am not completly confident in ffdshow and I personally don't know how Haali works on Seven.
At this moment I run MKV with no problems usng Gabest MKV splitter, CoreAVC and AC3Filter.
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