there are viruses, but you just havent gotten one yet. but with unix user access system, it will not delete the whole system paritition if you are not logged on as root. software doesn't work when upgrade processor, i think apple is telling you something. [bad design]
i have Xp 2000+ 1GB of ram, ECS(50bucks) MB, runs fine. upgrade your memory, turn off virtual memory, if you can afford to do so.
firewall blocks incoming connection. software like zone alarm, norton internet security suite allows you the control other software from opening outgoing connections. need 1GB + memory, TURN OFF GOD DAMN WINDOWS VIRTUAL MEMORY.
boot into your win2k operating system in SAFE MODE w/networking support by pressing F8 to show boot menu then backup your data to another computer by using the network connection. reformat, reinstall. no other way to do it.