I have two computers both HP. About 1.5 years difference in age. Both Windows XP pentium 4s. On the older machine I can play with out problems homemade DVD in either the -R or +R format in either the PAL or NTSC video system. On the newer machine I can ony play the NTSC versions. They use the same external Sony DVD+/-R writer. Can anyone tell me what I can do to fix this on the newer computer? I live in the USA.