UPDATE: I had a comment asking about problem resolution. The memory leak was resolved by updating the Dell Wireless 1370 WLAN driver (reference below). The updated version of the driver is an 89 Meg download: http://ftp.us.dell.com/network/R174291.exe
=========================================
After removing SP3, my memory leak issue re-surfaced. I used Process Explorer, configured it to display Page Faults, Private Bytes, and Virtual Size, and I found the culprit. The Dell Wireless driver had something like 8MM page faults.
This process (BCMWLTRY.EXE) was visible from Task Manager, but I overlooked it. Killing the process from Process Explorer, it re-spawned, and immediately started spewing page faults. The new drivers was issued 18 Dec 2007, details are below and it's available for download from Dell Support.
Title : Network:Dell Wireless 1370 WLAN MiniPCI Card, Wireless 1390 WLAN MiniCard, Wireless 1395 WLAN MiniCard, Wireless 1470 Dual-Band WLAN miniPCI Card, Wireless 1490 Dual-Band WLAN MiniCard, Wireless 1505 Draft 802.11n WLAN Mini-Card, Wireless 1505 Draft 802.11n WLAN Mini-Card Desktops Driver
Version : A17
OEM Name : Dell
OEM Ver : 4.170.25.12
Computers : Dimension - DXP061, DXC061;
Inspiron - 1520, 1720, 1420, 1521, 1721;
Inspiron Desktop - 530, 530S, 531, 531S;
Latitude - D430, ATG D630, D530, D531, XT, D631, D620, D630, D830, D420, D620, D520;
OptiPlex - 745, 320, 740, 755, 330;
Precision - M2300, T7400, T5400, M6300, M4300, 390, 690, 490, M65, M90, M60, M70, M20;
Vostro Desktop - 200, 400;
Vostro Notebook - 1000, 1500, 1700;
XPS - MXP061, MXG061, XPS 720, M1730, 420, M1330
Oses : Windows XP Home Edition, Windows XP Media Center Edition, Windows XP Professional, Windows XP Tablet PC EditionWindows XP x64 Professional Client
Labels: hardware, Software