Wild Weasel....
Executive SummaryWin98SE (even with SP2) will never be "secure" in the eyes of business, but is secure enough for home use.
To secure your box take the following 4 steps:
1. Apply WinSE98 SP2.x
2. If using BroadBand, get a Router that does NAT (iow has DHCP)
3. Install a good virus scanner with SpyWare detection AND removal
4. Use FireFox instead of IE
Technical ExplanationThe main reason 9x will never be secure in a business scenario is because there is no permissions or ownership on file on a Win9x box.
So if 2 people can login to the same box, there's no easy way for you to protect me from reading/rewriting your files. The file system with this kind of security is NTFS, used in NT3,NT4,Win2000,WinXP,Win2003,etc). DOS, Windows 95/98/ME all used a file system known as FAT. Both FAT and NTFS have had improvements over time, but FAT will never support proper file permissions and ownership.
There are tons of other reasons why the 9x kernel (core) is not reliable or secure because of weak memory protection, instability (one sloppy app can crash the whole machine) and 98's inability to clean up memory properly, but that's a whole other rant in itself.
I'd also like to point out, an out of the box Win98SE installation with all public Windows Updates applied is NOT secure, IMHO you have to apply this Win98SE SP2 in order before I'd begin to call the box secure for home use.
Obviously you should still run a decent virus scanner (
Panda Antivirus is the best but the best comes with a catch, 30+megs of ram) and if your virus scanner doesn't protect from AND remove spyware (many AV apps can't do either) then you need some spyware protection. If you don't want to buy a AV, then
Avast Free Antivirus is good (for being free).
Finally you should use some kind of DHCP router (aka NAT). You can get a LinkSys router for $20-$40 and it will give you all the protection you need. Please note most people confuse a firewall with a DHCP router, which is all you need as it protects you from outsiders. Please note a DHCP router does not protect you from naughty programs on your PC going out onto the Internet but this is why you need a good AntiVirus program.
Since we're talking about 98 where new updates/fixes won't be coming out directly from Microsoft, you're better off using FireFox as you are very unlikely to get SpyWare. While IE6 on XP SP2 stopped most spyware and IE7 will put an end to spyware (as it's made today), neither of these versions of IE will work on 98, so FireFox is the only secure route you have now.