I'm starting to think you are right, But what actually causes it? I have 4gb of ram in this pc (although it can only use 3 I think) It pretty usable, not that slow at all otherwise.
What specification is the XP machine? How is the network port connected? Is it on the motherboard or a card? If a card, what type of connector? How old is the machine? What is the CPU ?
Packard Bell NEC Packard Bell Computer PB34225401
Windows XP Media Center Edition Service Pack 3 (build 2600)
3.05 gigahertz Intel Pentium 4
16 kilobyte primary memory cache
1024 kilobyte secondary memory cache
Board: NEC COMPUTERS INTERNATIONAL GA-8I915PMD
Bus Clock: 133 megahertz
BIOS: Award Software International, Inc. 10g 11/25/2005
3072 Megabytes Usable Installed Memory
The network card seems to be part of the motherboard
Realtek RTL8139/810x Family Fast Ethernet NIC
I'm not sure what you mean by the connector.. it just seems to be a small plastic black box thats attached to the motherboard - the socket protrudes out the back of the pc from this.
Pretty old pc - never had any problems with it up to now.