I just found this thing called flv to wmv video converter (it's for mac, if you need windows get FreeStudio and use 3GP video converter) it's free.
I think the FLV to AVI MPEG WMV 3GP MP4 iPod Converter is your best choice, it always works well for me. it can convert Flash Video FLV to AVI, FLV to MPEG, FLV to WMV, FLV to MP4 format.with excellent quality.
Here is a guide about how to convert FLV to WMV, same way to convert FLV to AAC because Daniusoft video converter support convert FLV to AAC too.
Windows media player doesn't support flv format,so you can't play the flv files on it. You can use convert flv files to wmv,avi,mp4,etc. I recommend you 4Media FlV to WMV Converter.It is the professional FLV to WMV converter software which can convert FLV videos to Windows media files including WMV, ASF videos and WMA, WAV, MP3 audios for playing on Windows media players and Windows mobile devices.It's easy to use.You can have a try. You can use VLC player
Throw your .flv files into a converter program like Free HD Video Converter Factory or VLC (if you'd already have it installed), and choose WMV format to make the conversion.
Go to cnet.com and download "free convert MPEG WMV to MP4 FLV AVI converter" you can use it convert videos to play on your iPhone, Xbox, PSP, and iPod.
uSeesoft FLV Converter can do it for you it can convert FLV and YouTube videos to almost any video/audio format with unmatchable conversion speed and high quality, such as converting FLV to WMV, converting FLV to AVI, converting FLV to MP3, converting FLV to MPEG, converting FLV to MP4, etc.
I always use Nidesoft video converter, this converter can convert flv to mp4 in high quality at fast speed, besides, it can convert between almost all oher popular video and audio formats. it is also easy to use, only a few clicks were needed.Convert any online flv / youtube video to iPod / zune / PSP / MP3 / MP4 Portable player directly.it is full free!!You can use moyea flv converter and FLV to AVI MPEG WMV 3GP MP4 iPod Converter V4.2, both of them are professional FLV converter software which can convert Flash Video FLV to AVI, FLV to MPEG, FLV to WMV, FLV to 3GP, FLV to MP4, FLV to iPod, etc.
I use a Flash to Video Encoder PRO. Very easy to use program. You can convert flash files to video movie AVI, mp4, ASF/WMV, mpeg files, etc.
Search a normal flv converter or a video converter ultimate It supports convert FLV file to popular video formats including AVI, MPEG, WMV, DivX, Xvid, ASF, 3GP, MP4, iPod, PSP, Zune and convert FLV to audio formats MP3, WMA and WAV.
use a converter like, SnowFox Video Converter or, FLV to AVI MPEG WMV 3GP MP4 iPod Converter to change the format.
At first, convert FLV to other formats such as AVI, MPEG, etc. Then burn them on DVD. I usually use this program Aunsoft FLV Converter to help me do this trick. It can convert FLV to many other popular formats, such as MP3, WAV, AVI, MPEG, MOV, WMV, MP4. compatible with VCD, SVCD and DVD etc. It's easy-to-use and the conversion speed is fast. So I think you can have a try: http://www.aunsoft.com/flv-converter/
You can watch FLV with Moyea FLV Player. you can download FLV with Moyea YouTube FLV Downloader. You can convert videos to FLV with Flash Video MX Pro. You can convert FLV to Videos with FLV Editor Pro.