I have roxio dvd le on my Inspiron 6000 and it will not play dvd's anymore

First thing Do you have the Roxio CD that which you could have recived along with the laptop?
If yes Great.. go to start>control Panel> Add/Remove Programs> uninstall everything which ever says sonic or roxio in the list you might have upto 5 to 6 or 7 in the list.. uninstall all of them one by one.. then restart the computer and install the CD completely the problem will solve..

If you dont have the CD..if you are in US call 8006249896 thats dell tech support number and tell them that you didnt recive a single cd along with the computer they will send you all the cds including you operating system..ask them to send the roxio cd also..

If you dont want to go through all of this just go www.filehippo.com and download the latest version of K-Lite Codec Pack under audio and video section in the main page..install it and then try to play the DVD using the same player or different player like media player or media player calssic which is very good..
You can access the Media player classic from start > all programs> K-lite Codec Pack> Media Player Classic open it and press Ctrl+D it will play your DVD