Most likely your problem is caused a corporate policy put in place by your company. If your background is changed to the same image as your colleagues then a company wide standard is in place and you will be unable to change the image. Check with your technical support team for more information.

1. How do I add or remove icons from my desktop?
2. How do I make Windows XP run faster?
3. How to fix "Task Manager has been disabled by your administrator"
4. Unable to Start a Program with an .exe File Extension
5. My Taskbar has disappeared - how do I get it back
6. My computer seems hung up. The mouse and keyboard do not respond but the screen is on. What should I do?
7. When I am surfing the internet I get pop up boxes that say my computer is infected and it prompts me to run a scan. Should I run this scan or not?
8. How to Clear Recent Documents in the XP Start Menu
9. How to Enable Parental Control in Windows Media Player for Windows XP
10. How to make your Desktop Icons Transparent
11. How to enable boot defragment for better performance
12. How to restore the Show Desktop icon to Quick Launch bar
13. How to get rid of Windows Messenger
14. On Screen Keyboard
15. How do I stop the Task Bar buttons from grouping?
16. How to start up without needing to enter a user name or password
17. I get a balloon pop-up that says my Virtual Memory is too Low. Help!
18. How to fix a slow shutdown
19. Placing Shortcuts on Your Taskbar
20. GPS and Your Windows XP-based Laptop
21. My computer won't shut down itself after installing XP
22. How can I lock my computer faster
23. How to Install and Run Windows Automatic Updates
24. Speed up your browsing of Windows 2000 & XP machines
25. How to add programs to stay on the Start menu
26. Useful Keyboard Shortcuts
27. How to stop tasks by using command line
28. How to run a program as a different user
29. Every time I login to Windows my desktop starts to load then it takes me right back to the login screen. Why?
30. How to get an older program to run on Windows XP
31. How do I use the integrated CD burning feature in Windows XP?
32. How to Install GPS on a Windows XP-Based Laptop
33. How to remove duplicate records or create list of unique records in Excel
34. How To Add and Enable Additional Languages in Windows XP
35. Configure Your Laptop's Power Options
36. What's the difference between logging out and locking my computer and why would I want to do either?
37. Here are 5 keyboard shortcuts even your IT staff might not know!
38. I got a complicated error message and I want to research it.
39. How do I print parts of a document without printing one page at a time or the whole thing?
40. How to map a folder from the network as a drive on your computer
41. To turn the Windows XP visual design on:
42. How to make My Computer open in Explore mode with folder list
43. How to make extensions visible for all files
44. Delete files immediately, without having them move to the Recycle Bin first.
45. How to access easier Device Manager
46. How to rename a series of files
47. How can I find the uptime of the computer
48. How to Disable Autoplay on All Devices