That link returns a quote regarding the performance of a XPSP2 VIRTUAL machine (IE, a guest OS not the host.) It states nothing about SP2 on the Host OS. Winchester is installing SBS 2003 as his guest, not Windows XP so that link you provided means absolutely nothing. Furthermore you have not provided an KB article describing this problem. If it is a problem there will be a bug filed on it (long before a KB article) and there isn't.
Since I spent a year at Microsoft supporting Virtual PC 5.2, Virtual PC 2004 and Virtual Server 2005 as well as Windows XP Pro and Service Pack 2, I am going to have to ask you to do better.
I already stated what the likely cause of Winchesters problem is.
I also renew my previous declaration of Shenanigans
