... bytes to add to the start of the 16 byte blockto locate the desired byte in memory. For example, if the ds registeris set to 1 275 Hex and the bx register is set to 4 57 Hex, then the physical 20 ... computers are simplytheir own fault. For example, they accidentally delete all the filesin their current directory rather than in another directory, as theyintended, or they format the wrong disk. ... end of the file.4. Next, it reads the first few bytes of the file intomemory, and writes them back out to the file in aspecial data area within the virus’ code. The new viruswill need these...