For those who wish to Disable the F8 key during the boot process, here's one option. During the initial boot sequence, it is possible to block all keystroke until the "start menu" process finishes. It is important to realize that not only "F8" will be blocked, but also all "multiple boot" option will become impossible.
If the above statement does not represent a problem, then follow this procedure with EXTREME precaution:
a) In a command shell (CMD), remove all attributes of C:\NTLDR with the command:
attrib -r -a -s -h c:\ntldr
b) Edit C:\NTLDR, line 760 (in hex), using "HDD HEX EDITOR" (freeware) :
replace:
7f 66 53 e8 1f 1c b8 00 01 cd 16 0f 85 09 00 66
with the new end values:
7f 66 53 e8 1f 1c b8 00 01 cd 16 90 90 90 00 66
and save the corrected NTLDR
c) In a command shell (CMD), re-install all attributes of C:\NTLDR with the command:
attrib +r +a +s +h c:\ntldr
Finally, reboot and the "F8" option is no longer available
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