Hoster 5 + Windows 7 needs advanced k-lite codex to play mp4 video

[mrmacjr]

I have a laptop Dell 17T with 4gb ram 160gb internal hd with 1.5 tb external. and a dell precision 380 dual core with 2gb ram. Laptop is running Windows 7 home and the desktop is running Windows 7 pro. neither will run mp4 video. I imported the mp4 and checked the file and it has the mp4 and kmh file in the folder. I have 2 other desktops that run windows xp and after intalling k-lite codec ran mp4 files properly. The 2 with Windows 7 have had k-lite codecs installed and still show the video to be 54:12 in length and the comp with xp show the 4:12 proper length. I hope this the right spot to place this post. thanks in advance for your help.