I was doing a copy and paste from an USB key with folders of pictures when my VIPER antivirus warned me a malware was blocked from opening: my computer froze instantly, and i had to force shutdown after 4 minutes of waiting; problem is, it never rebooted. I unplugged every USB stick, hard drive and DVD drive and still the BIOS wouldn't appear. Then i got the idea of unplugging the memory modules for one hour, and put them back in . The computer booted this time and the BIOS appeared, but with a warning in red: "Warning: the previous performance of overclocking is failed, and the system is restored to the default setting. Press any key to enter setup." Now everything is back to normal, i have cleared the malware with VIPER , but i can't flash the BIOS with the MSI utility ( i have a MS-7536 motherboard) because it says it can't write to the floppy ( but it's a brand new one i've just bought; i've tried 3 with the same result) even though it can format it slowly with no problem: the error message is "impossible to create the emergency BIOS backup because the file can't be copied to the disk" ( before writting the new bios, i'm obliged to create a backup of the infected bios, otherwise the utility won't run). Can anyone give me an advice on how to flash my BIOS ? Will pulling the CMOS battery out for the night clear the virus ? And to avoid all this trouble in the future, can anyone tell me which motherboard i can buy that gives the option to physically prevent (by pulling a jumper i guess) BIOS infections ?