Hi,i advise you use a free youtube downloader. here is a free youtube downloader called leawo free youtube download. it can download easily and quickly video from many video sharing sites like youtube,myspace,Dailymotion with speeding up function. http://search.yahoo.com/search;_ylt=A0oGkziRH6pKCJMAXIJXNyoA?fr2=sg-gac&sado=1&p=leawo%20youtube%20downloader&fr=yfp-t-701&pqstr=leawo%20youtube%20&gprid=vMDh9f_kRaiY5K8e5RSW8A&sac=1&sao=1 after you finish download it you still should convert it to other popular formats such as wmv,mp3,mp4, avi,3gp,3gp2 etc. you can find it here ------------------------
For Windows: http://search.yahoo.com/search;_ylt=A0oGkxPCdUlK9mUB08RXNyoA?p=leawo+flv+converter&y=Search&fr=ytff1-tyc&fr2=sb-top&sao=0
For MAC: allhttp://search.yahoo.com/search;_ylt=A0oGklcpNoVK9QQBhhxXNyoA?p=leawo+mac+flv+converter&y=Search&fr=yfp-t-151&fr2=sb-top&sao=1 all can be completed by several mouse clicks, just have a try.