I'm looking for a free firewall that will just do the basics - block/all any applications from accessing the internet (check for modified programs), stealth mode on all ports (no response (open/closed) to unsolicited scans), and preferably blocks http-referrer. I don't care about customizations beyond that.
The laptop has a 133mhz pentium and Windows 98SE with 48MB of ram. Most of the free firewalls I've found require a newer processor or more memory.
I tried Kerio, but it keeps crashing the system. I read the system requirements and it says I shoud have 64MB of RAM. (Everything else runs fine on the computer.)