Windows XP: svchost.exe

svchost.exe

I've been having some serious problems with a really sluggish system lately, despite regularly doing all the daily housecleaning, i.e. AntiVirus/Spyware scans, Reg Cleaning, Defrag, ScanDisk, sfc, startup etc. However, pages are still taking forever to load and some don't respond at all. I use both IE6 and Firefox. I thought the problem might lie within running processes and found that "svchost.exe" has 6 entries, 2 under user name NETWORK SERVICE AND THE OTHER 4 under SYSTEM. Is this normal, and could it also be the reason why my internet connection doesn't connect automatically despite me setting it to do so??? I use my PC for personal use at home. My OS is Windows XP Home Edition, SP3, CPU Name AMD Athlon(tm) 64 Processor 3200+
L1 Cache 128KB L2 Cache 512KB, Motherboard - SMBIOS Version 3.15, BIOS Date 19/10/2005, Physical Memory -
Memory Bank Bank0/1
Description Physical Memory 0
Device Locator A0
Capacity 512MB
Speed 400Mhz
Manufacturer NULL
Data Width 64bit
Memory Type Unknown
Form Factor DIMM
Memory Resource
Total Memory 383MB
Used Memory 259MB
Free Memory 123MB
Memory Usage 67%