I got a win model 70 308 serial number 862911

Mark, I'm not sure if you ever got your answer in all of that above but just in case you didn't....yours is in the war years 1944, or 45. Winchester kept no records of public serials those years because pretty much all of their manufacturing went to the war effort. Simply no record keeping. In 1942, #1221289, was sold. 43, 44, 45, 46, and 47 there were no records. In 1948 they began again at the number 1500000. You can't get any accurate to the day date on yours but if you divide those numbers by the five years you get approx 55,700 a year. So 1221289 + 55700 is approx 1277000. Add another 55700 and you get approximately late 1944 to early 45 for your rifle. I hope that helps.

TRY THIS LINK
http://www.gunvaluesboard.com/marlin-serial-numbers-dates-of-manufacture-1664.html

1954

http://www.proofhouse.com/win/index.html

hope youre not trying to install it using the old serial number on the sticker on your case? It should have come with a new serial number to install. You also have to have XP or Vista to perform an upgrade otherwise you need a full installation CD.