1.ppl who face probs workin with videos in WMM
error message like ' not indexed and cannot be imported' pops in then go 2
http://www.softpedia.com/progDownload/Windows-Media-Player--Codecs-Pack-Download-1498.html
and download the latest codecs

2.If u directly download videos from the site make sure u downloaded the complete file.. sometimes the download might finish before saving the full file in your computer.