All to make a PC do what every Amiga does right out of the box; run well.
That's simply not true. Maybe WB1.3 on an A500, but anyone who has built a classic "power" system can attest that getting an operative amiga OS can be a royal PITA.
Them fact is, computers in general are a PITA sometimes... and sometimes not. Doesn't matter what OS.
To the OP:
Someone mentioned getting the correct chipset drivers for your mobo, and that does sound like your problem. Make sure all your drivers are correct first, then move on to some of the other suggestions.
If you want to use a virus scanner, I recommend AntiVir. It's free, and not a resource hog like Norton. (There are other good scanners out there, as well.)