How to Clear NVRAM
Non-Volatile Random Access Memory (NVRAM) is a type of Random Access Memory that can retain information, such as modem parameters and other configuration information, even when your computer is turned off. You may want to clear NVRAM if you have contracted a computer virus that cannot otherwise be cured. However, doing so will cause you to lose important system configuration information.
Click "Start", type "cmd" in the "Search" box and press "Enter". The Command Prompt opens.
Type "Debug" (without quotation marks) and press "Enter". You will see a line that reads "C:\WINDOWS>DEBUG".
Type each of the following commands, pressing "Enter" after each command before proceeding to the next command.AMOV AX,0MOV AX,COUT 70,ALMOV AX,0OUT 71,ALINC CXCMP CX,100JB 103INT 20
Enter a blank line and hit "Enter". Type "G" (without quotes) and hit "Enter". Type "Q" (without quotes) and hit "Enter".
Close the Command Prompt and restart your computer.