I’ve moved your thread to the Technical Support section for further assistance from our Activision Assist staff.
Please note that this thread was originally posted in the General Discussion sub-forum.
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Modern Warfare, Black Ops, Ghosts
" Memory: 4096MB RAM"
It appears you are a little below the minimum system requirements as the game lists needing 6 GB of RAM
Here are the minimum system requirements for running Call of Duty: Ghosts:
OS: Windows 7 64-Bit / Windows 8 64-Bit
CPU: Intel® Core™ 2 Duo E8200 2.66 GHZ / AMD Phenom™ X3 8750 2.4 GHZ or better
Memory: 6 GB RAM
Hard Disk Space: 40 GB
Video: NVIDIA® GeForce® GTS 450 / ATI® Radeon™ HD 5870 or better
Sound: DirectX compatible sound card
DirectX®: DirectX® 11
Internet: Broadband Internet connection for Steam and Online Multiplayer