Bizarre CD-Writer behaviour..

Hi guys,
 
I am having no joy getting my DVD-writers (Samsung and/or LG) to burn disks. The process goes halfway and then just hangs, both in Sonar and in CD Architect. I am running a desktop Win7 64bit Ultimate on an Intel DQ67SW motherboard with Intel Quad 2600 chipset, Seagate SSHD drives..
 
It used to work fine but over the last year so it has become steadily more unreliable. Now it's just useless.
 
I was told that I should uninstall all my anti-virus programmes and scan the system with Norton (trial) which I did. Still no luck.
 
The writers will read a disc, but not write CD-R.
 
Any input would be rather useful. Thanks so much!!

I do a lot of audio CD burning - several hundred CD's every year.  The current drives - 5 USB connected drives, have been in use for over 5 years. 
 
Disable the Windows CD burning option and see if that helps.  I've seen burning problems because of the Windows burning functions.  Also, if you have any "packet writing" CD software installed (e.g. Nero "InCD", Roxio "drag to disc") disable those as they have been known to interfere with burning.
 
However, as sock monkey notes, try a different batch/brand of CD-R's and see if that makes a difference.  Avoid Memorex brand discs, they have a flakey history.   I only use Taiyo Yuden discs for my audio burning.