[Bungleau]

There is a difference between "an" administrator account and "the" administrator account. "The" account has more privileges, and can sometimes make a difference.

That being said, older games probably don't care all that much.

Defender is the MS Firewall utility, although it appears to be called just "Firewall" on my XP machine here. Check its status at Control Panel / Security Center, and click on "Manage Firewall Settings" on the bottom.