I guess you have a Windows 7 Starter Edition. In Starter Edition you can not change the background or otherwise personalize it. However, from our superb Tutorials section you'll find Brink's workaround for that issue. Read it here.
Kari
My Computer
At a glance
Windows 10 Pro x64 EN-GB1.6 GHz Intel Core i7-720QM Processor6 GBATI Mobility Radeon HD 5850 Graphics
Computer type
Laptop
Computer Manufacturer/Model Number
HP ENVY 17-1150eg
OS
Windows 10 Pro x64 EN-GB
CPU
1.6 GHz Intel Core i7-720QM Processor
Memory
6 GB
Graphics Card(s)
ATI Mobility Radeon HD 5850 Graphics
Sound Card
Beats sound system with integrated subwoofer
Monitor(s) Displays
17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution
1600*900 (1), 1920*1080 (2&3)
Hard Drives
Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Cooling
As Envy runs a bit warm, I have it on a Cooler Master pad
Nice advise Kari, with your input to the tutorial section I also learned something new. Thanks
My Computer
At a glance
Win 7 Pro x64, VM Win XP, Win7 Pro Sandbox, K...AMD Athlon(tm) II X4 640 @ 3.0 Gbz12GB 1066MHz DDR3 SDRAM - 2x4GB, 2x2GBATI Radeon HD 4350 HD Graphics/Audio with 512MB
Computer Manufacturer/Model Number
HP Pavilion a4302f
OS
Win 7 Pro x64, VM Win XP, Win7 Pro Sandbox, Kubuntu 11