My DVD writers wont complete its Writing process. Why this could be?

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I bot a DVD Writer in 2007 oct, its Samsung Super write master 20X for my desktop. I never wrote even a single DVD for almost a year (because it never need to write one) But after almost a year, i inserted a Empty Sony R-DVD to write some imp data using NERO 8. Its process went smooth till 51% in just 5-8min and after that even for an hour it was still at 51% and the process did not continue. I aborted and threw that disc into bin and inserted an another empty disc (felt that something might be wrong with the previous disc), but it was the same 51% halt with the 2nd one too. I even tried Samsung discs and even a local made Dvd disc and the results wer same. Because of this i lost almost 8 DVD discs. Now i am just able to Read discs with that and even being bot a writer i never wrote a Single disc. OK let it go and i assumed it might be the problem with the Samsung Writer or even my desktop PC. I was given a HP Compaq 6710b Laptop in 2008 jan by my office. It had a Toshiba Writer and it created some strange problems and stopped writing disc first and then Reading too. It became useless. But then my laptop got corrupted and needed to reinstall Vista in my laptop. In order to insert vista booting disc, i needed a ROM and so i had to buy a new Writer for my laptop, its Sony Optiarc DVD-RW AD-7580A ATA. But happily i wrote more than 10 good Sony DVDs with it. But some days ago i met with the same strange problem as that of the problem i met with Samsung Super write master 20X 3 years ago. The thing was, it wrote data till 93% and after that no more progress. I mean its a complete halt after 93%. Now its 10 DVDs i lost due this Unknown problem. :( Really Strange :( Wat the hell this could be??? Conditions- I never use Bad, corrupted, Damaged, Scratched Disc. (only use them on my LG Dvd reader on desktop) I always write disc at half the max speed. I never write more than a disc continuesly. (Just 1 or max 2 disc a month, it depends upon requirement, sometimes 1 disc in 3months too) I dont hav any virus in my laptop or the desktop (upto 99%) I used registry cleaner and even the registry changing stuffs, no use. Same results on both my P4 desktop as well as Core 2 duo laptop. Any techie guy there who can help me... Please HELP!!!!