I get those Side-by-Side errors but when I looked into it the general advice seemed to be just ignore them. I just checked my logs and the ones in there at the moment all appear to apply to some specific application unrelated to MP, like ultravnc. It looks like I've already got all the Visual C+ Redists installed on my Windows 7 x64 system and on my x86 system all but 2008 6161 (10/04/2012) and I still get them but I can't see how they're connected to not being able to play certain links in OV.