That could explain things. Now, to verify, do you have any dual-layer DVD movies to try (should state on the packaging and the disk itself)? Alternatively, what is the make and model number of the DVD drive in your machine?
System Manufacturer/Model Number Dwarf Dwf/11/2012 OS Windows 7 Ultimate x64 Service Pack 1 CPU Intel Core-i5-3570K 4-core @ 3.4GHz (Ivy Bridge) (OC 4.2GHz) Motherboard ASRock Z77 Extreme4-M Memory 4 x 4GB DDR3-1600 Corsair Vengeance CMZ8GX3M2A1600C9B (16GB) Graphics Card 2 x AMD Radeon HD7770 1GB CrossFired (OC 1100MHz/1250MHz) Sound Card Realtek High Definition on board solution (ALC 898) Monitor(s) Displays ViewSonic VA1912w Widescreen (VGA) Screen Resolution 1440x900
Keyboard Microsoft Comfort Curve Keyboard 3000 (USB) Mouse Microsoft Comfort Mouse 3000 for Business (USB) PSU XFX Pro Series 850W Semi-Modular Case Gigabyte IF233 Cooling 1 x 120mm Front Inlet 1 x 120mm Rear Exhaust Hard Drives OCZ Agility 3 SSD 120GB SATA III x2 (RAID 0)
Samsung HD501LJ 500GB SATA II x2
Hitachi HDS721010CLA332 1TB SATA II
Iomega 1.5TB Ext USB 2.0
WD 2.0TB Ext USB 3.0 Internet Speed NetGear DG834Gv3 ADSL Modem/Router (Ethernet) ~4.0 Mb/s (O2) Antivirus Avast! 7.0.1474 Browser IE 9 Other Info Optical Drive: HL-DT-ST BD-RE BH10LS30 SATA Bluray
Lexmark S305 Printer/Scanner/Copier (USB)
CTF-430 Tablet & Pen
WEI Score: 7.7/7.9/7.4/7.4/7.9
Asus Eee PC 1011PX Netbook (Windows 7 x86 Starter)
System Manufacturer/Model Number Custom Built PC OS Windows 7 Ultimate x64 CPU AMD Athlon II x2 2.8MHz (2 Cores) Motherboard ASUS M4A785-M Memory 6GB DDR2 1600 RAM Graphics Card HIS - ATI Radeon HD 4670 1GB DDR3 Sound Card VIA HD Audio? Monitor(s) Displays Acer LCD Monitor 17" + Polyview V17D 17" Screen Resolution 1280 x 1024 x 60 hertz
Keyboard Logitech G11 Gaming Keyboard Mouse Logitech Trackball (Wired) PSU 575W Logysys PSU Case Sunbeam Transformer Cooling 6 Fans - 1 x 120mm, 3 x 80mm, 1 x 220mm, 1 x 90mm PCI Slot Hard Drives Hitachi HDS721616PLA SCSI Disk Device 160GB Split into C: and D: Partitions
WDC WD32 00AAKS-00L9A SCSI Disk Device 320GB 16MB Cache Internet Speed 12MB/s Cox Communications
System Manufacturer/Model Number Custom Built PC OS Windows 7 Ultimate x64 CPU AMD Athlon II x2 2.8MHz (2 Cores) Motherboard ASUS M4A785-M Memory 6GB DDR2 1600 RAM Graphics Card HIS - ATI Radeon HD 4670 1GB DDR3 Sound Card VIA HD Audio? Monitor(s) Displays Acer LCD Monitor 17" + Polyview V17D 17" Screen Resolution 1280 x 1024 x 60 hertz
Keyboard Logitech G11 Gaming Keyboard Mouse Logitech Trackball (Wired) PSU 575W Logysys PSU Case Sunbeam Transformer Cooling 6 Fans - 1 x 120mm, 3 x 80mm, 1 x 220mm, 1 x 90mm PCI Slot Hard Drives Hitachi HDS721616PLA SCSI Disk Device 160GB Split into C: and D: Partitions
WDC WD32 00AAKS-00L9A SCSI Disk Device 320GB 16MB Cache Internet Speed 12MB/s Cox Communications
Ok since your dvd player is doa for the game disk, the other thing you can do is to share the dvd over the network. Homegroup sharing is not working so you want to change to "workgroup" instead