I've seen this (or very similar) under Win3.1, Win3.11, Win95, Win95B,
Win98, Win98SE when installing a very large variety of applications. I'm
guessing it's a DOS bug that some install programs see, and others
get around somehow. I've seen it during some of the SF installs i've
done, but not all.
It scared me some at first, but now i just ignore it. I only worry about it
if it shows less than 2.1 GB, which is usually then an accurate reading.
I usually try to keep at least 10GB free on my Windows and application
drive.
Windows has lots of bugs. I like to keep my files on a removable firewire hard drive. So I sometimes copy a whole 4GB partition as once. Get this, Windows Explorer starts out showing the progess bar with a time remaining of maybe 3-4 minutes, it goes all the way to the right suggesting it is finished, then it shows some ridiculously large number like 134543567 minutes remaining, then counts down from there skipping and jumping up and down all over the place. I just laugh.
I'm running Windows ME with a 75gb IBM drive partitioned as 3 25gb discs and a 20gb Quantum drive as a single partition.
I did just load the Intel "Application Accelerator" which is their ATA driver so maybe thats the problem.