Ok, here is a bit of information on my system.
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2
Processor: Dual Core AMD Opteron(tm) Processor 170, MMX, 3DNow (2 CPUs), ~2.0GHz
Memory: 2048MB RAM (Corsair 3500LL PRO)
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Card name: NVIDIA GeForce 7800 GTX
Description: SB X-Fi Audio (Sound Card)
Model: BENQ DVD LS DW1655
Driver: c:\windows\system32\drivers\cdrom.sys, 5.01.2600.2180 (English), 8/4/2004 04:00:00, 49536 bytes
Model: LITE-ON DVDRW SHW-160P6S
Driver: c:\windows\system32\drivers\cdrom.sys, 5.01.2600.2180 (English), 8/4/2004 04:00:00, 49536 bytes.
I did some research on the web and found that there are a lot of people who share the same problem on various applications. Just try a google search on "memory could not be read". The problem has existed for quite some time with no apparent solutions. I opened up a ticket with PowerDVD to see if they could resolve.
I am able to play DVD movies using InterActual Player and the Windows Media Player.