Possible reason(s) for very slow PC in this case?
1GB RAM 1.5 ghz processor, 8+ year old Dell Optiplex tower. Not a good start, but after a full reformat of windows XP sp2 then updating to sp3 and all the other windows updates and installing basically no programs or any files or even going on the internet to possibly pick up a virus or something, it ‘s very slow right after a full reformat. Freezes up, typing in IE skips letters, sometimes puts numbers instead of letters, have to alt +ctrl+delete frozen IE/programs, etc. I have full antivirus and firewall etc.
I switched out the hard drive and RAM with new ones, and still the same, no fix. Other computers on the same router/network (though network is private) work fine.