I think i saw this thread already , but i can't find it.

I had to solve this problem today for myself and here is what i did:

#1 Install Winamp (google it..)

#2 Install FFDSHOW http://www.free-codecs.com/download/FFDShow.htm


#3 install nsv tools http://www.nullsoft.com/nsv/nsvtools-setup.exe

#4 download these files http://animeamanga.com/hosting/nsv_x264.zip

#5 With the files downloaded in #4 , unzip them, and then place the nsvdec_x264.dll in your c:\program files \ winamp \ plugins folder.

You should be ready to go now, I have heard sometimes nsv files work easily for people , but not for me, and i suspect other people have had some problems so they can solve it like me.