never seen this error

Win 7 disc is good used on other pc

R4 detects the disc and boots from Win 7 but when I clicked start to begin install

keeps getting msg

missing a dvd driver

bios is A06

this pc had a fastidious bios before would not POST from 4x8 GB I had to change to 4 GB

now I replaced cmos battery and it is taking the 4x8 GB

do not want to update bios due to the history of no POST when 4x8 GB was used

I think it has a delicate bios