You may need time to digust that the XP OS is based on Windows 2000 which draws from NT. In no uncertain words, the items you listes are parts of the OS system and it won't work without such. The only item I don't instantly recognise is "Smc.exe" and it's odd to see services.exe.
You should research each item with both Googgle and Black Viper, but I see nothing to touch here.
In closing, you should have the OS fully patched and clean according to Spybot, Adaware, Cwshredder and Housecall.
I'm not sure that I absolutely need or even use some of the processes/services that startup with my computer & subsequently remain active on the pc. I'll list some of the ones I'm less familar with, and am hoping for some more experienced advice on what these actually do & whether I can stand to disable them & gain some needed extra memory...
Processes: CPU Usage: Commit Charge: 158M/921M
csrss.exe SYSTEM 00 3,200 K
Isass.exe SYSTEM 00 5,772 K
services.exe SYSTEM 00 2,984 K
Smc.exe SYSTEM 00 9,884 K
smss.exe SYSTEM 00 2,9464 K
svchost.exe SYSTEM 00 3,216 KK
svchost.exe SYSTEM 00 15,760 K
svchost.exe NETWORK SERVICE 00 1,972 K
svchost.exe LOCAL SERVICE 00 3,128 KK
System SYSTEM 03 216 K
System Idle Process SYSTEM 86 20 K
winlogon.exe SYSTEM 00 1,212 K