Philips DVDR228 not reading commercial DVDs

I`ve just bought a new pc and transferred my Philips DVDR228 from the old, on which the drive worked faultlessly, to the new, and now it wont recognize commercial DVDs, films, free dvds of magazines etc, the drive doesnt find the disc and the drive will lock up trying to read the dvd. Any dvds which I had copied on my previous machine are recognized and played without any problem. Both machines were using Windows XP. Anyone any ideas?

Cheers
Ian