What is the best dvd editing/ burning software????

Hi,

 

I have been editing some wedding dvds which i firstly ripped onto my computer and then edited them in win movie maker and then burnt them in sonic digital media. All setting were set to "high"/ "Best" quality and before burning the movie saved onto the computer in "save for viewing on dvd/tv" or similar to that - so my problem is that when i watched the finished dvd the quality isn't great and not clear you can see patches and squares on the tv screen.

 

How can i make sure the quality of the finished dvd is perfect and crystal clear???

The dvd was origianally burnt using nero and the quality is perfect. 

Would i have to buy nero - i've tried downloading it but when i burn it ejects the dvd as burnt but my dvd player say's it isn't????

 

please can someone help

thanks in advance.