Can't Access BIOS on Dell Dimesnion E521

Unfortunately, I don't think there is another way to get in to the bios other than what it says. I know that you got rid of this trojan, but you may be feeling the after effects of this virus. Some viruses will harm your computer physically and not just on your hard drive. You may have gotten ahold of one of those like that though. But you may be able to reset your bios another way. There is a connector on the board for the cmos and it should say on the board itself CMOS and right next to it 3 little pins with a connector on two of the 3. Just remove that connector and put it on the other side of those 3 pins and leave it there for about 5 minutes, then swap it back. That acts as a manual reboot of the bios itself. Try that and see if it works

use the bios reset jumper on the mother board to access the bios or try updating the bios