Get Final Media Player if you are tired of messing with codecs or tired of seeing the dreaded "Windows cannot open this file" error message.
Download and install Final Media Player and you will be able to play 3GP, ASF, AVI, AVM, AVS, DAT, FLV, IFO, MKV, MOV, MP4, MPEG, MPG, NSV, OGM, RM, RMVB, TP, TS, VOB, WMV and many other more or less obscure video formats!
Final Media Player is a non-bloated, simple video and Audio Player. It will not Burn DVDs or CDs, it will not help share your files but it will play almost any audio or video file you throw at it.