Wrong Mozilla version displayed!

I swear I'm using 1.7.2 but for some reason it displays the version in 
About as:

Mozilla 1.0.0
Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.0) Gecko/20020530

If I click the Mozilla 1.0.0 link it takes me to:

http://www.mozilla.org/releases/mozilla1.7.2

This is a new system and the only version of Mozilla I've EVER installed 
is 1.7.2.2004080302.

I found this in pref.js:

user_pref("general.useragent.override", "Mozilla/5.0 (Windows; U; Win98; 
en-US; rv:1.0.0) Gecko/20020530");

Can I safely edit this to read correctly and if so what is the correct 
version string for version 1.7.2?

Thanks!

NorCalIC