Test Mode may occur in Windows if an application whose drivers are not digitally signed by Microsoft is installed and still in the test phase.
Microsoft is providing a tool named “Fix It solution” to automatically remove the Test Mode watermark from the Windows 7 desktop. But if you want to remove it manually without using Fix It solution or by any other tools, follow one of the methods :
1 : Run the Command Prompt with administrative rights. To do this, type CMD in Start menu search field, and then press Ctrl + Shift + Enter keys simultaneously.
Or, navigate to Start menu -> All Programs -> Accessories -> right-click on Command Prompt entry and select Run as administrator option.
2: In the Command Prompt type bcdedit /set TESTSIGNING OFF and hit enter key. Wait till you see message “The operation completed successfully”.
3: Reboot your computer to remove the watermark.
If the above method is not working, use the procedure given below to remove the watermark.
1: Once again, open the Command Prompt with administrative rights (Follow Method 1’s Step 1 instruction).
2: Type and execute the following commands:
bcdedit.exe -set TESTSIGNING OFF
3 : Exit the Command Prompt, and then reboot your Windows. It’s done!
source : http://windowsfellow.blogspot.com/2013/04/how-to-remove-test-mode-windows-7-build.html
Jika ada gejala lain / kesalahan lain silahkan komentar di bawah , semoga saya bisa membantu :)