First open WMP and go to Options, then the DVD tab. If the Advanced button is not greyed, you can view information about all the codecs. If it's grayed I'd recommend a couple codecs options
First: Win7codecs 1.0.7 Final
|MG| Win7codecs 1.0.7 Final
or the standalone h.64 filter available here:
x264 Video Codec r1143
|MG| x264 Video Codec r1143
FFdshow is also another great codec, using the Dolby Surround feature it made a huge quality improvment.
Try this Google search:
ffdshow for windows 7
make sure to create a restore point
Operating System Windows 7 64-nit
Computer Type E-Machines (Customized}
CPU Type and Speed AMD Athlon™ II X2 250u Processor 1.60GHz Max 1.60GHz Ext 200MHz Cores 2 Threads 2
Motherboard Chipset eMachines
System Memory Type 6GB DDR2 RAM DIMM Speed 266MHz
Video Card Type and Speed NVIDIA GeForce 8500 GT 512 MB memory with HDMI out
Computer Monitor Vizio 26" HDMI monitor
Hard Drive Seagate ST375052 8AS (500GB) and WD25 00AAKS-00VSA (250GB)
Optical Drives HL-DT-ST DVDRAM GH41N
Network Adapter NVIDIA nForce 10/100 Mbps Ethernet
Anti-virus Software PC Tools Spyware Doctor with Anti-virus
Computer Skill Level Certified Professional
Windows Experience Index 4.5