Hi Peter,
We use old kit whenever possible. XP with service pack 2 if we can.
Norton and sometimes McAfee slow the system down to much on the older hardware. So we bined the lot.
But we do the following:
1. Always use Firefox as our browser. Uninstall Internet Explorer if you can as it's like a magnet for trojans Junk, etc. Firefox 4 seems OK, but 3.6.2 is rock solid
Firefox has some nice add ons (sometimes called plugins) that make life easier. Spell Checker (which I rely on too much), Add Blocker to stop adverts on sites, just by clicking the block button, Proxy server to allow BBC iPlayer to be viewed outside the UK. And all downloads are complete, Internet Explorer can leave out certain files. And many more
Note: If your BT technician uses a pacemaker, when you mention Firefox watch for the jolt!
2. Never leave your history stored on the browser, switch off all history before you use the browser for the first time
3. Do a disk clean of the C: drive at lease once a week
4. Run a trojan killer now and then (can't remember the name), but you probably have one in your bundle.
5. Use all software provided by your bank for internet security
6. Have dedicated bank accounts for internet usage
7. PayPal whenever possible
8. Get into the loop of software maintenance don't just hand the controls to someone else (BT). Although hard, well worth it in the long run.
This works for us, may not do the job for everyone
There is an industry setup around the fear we have connecting to the internet. You might argue that it is worst than the disease.