Maybe it's an driver installation order problem, the system needs the audio drivers installed prior to the modem since I believe they are both on the High Definition Bus. Here is Dell's official install order for the D620 with integrated Intel graphics...
1. Install the Dell Notebook System Software on a Dell Portable system from the Drivers, Utilities and Applications CD.
2. Install the Intel® Mobile Chipset Driver.
3. Install the SigmaTel STAC92xx Audio Driver.
4. Install the Alps GlidePoint/StickPointer Driver on Your Dell Portable System
5. Install the Conexant D110 MDC 1.5 v.92 modem driver.
6. Install the Intel® 945GM/945PM video driver in Microsft® Windows® operating systems.
7. Install the Broadcom 57xx Gigabit Integrated Controller Driver
8. Install the Dell™ Wireless 350 Bluetooth® driver in Microsoft® Windows® operating systems.
9. Install the wireless network adapter in a Latitude D-series portable computer.
10. Install the O2Micro OZ601 Cardbus Controller in Microsoft® Windows® operating systems.
Dell Latitude D620
Bios A02
Core Duo T2600 @ 2.16ghz
2048 MB DDR2 667mhz
NVidia Quadro NVS 110M TurboCache
100gb 5400rpm HD
Philips SDVD8820 DVD+/-RW Combo
SigmaTel C-Major HD Audio
Broadcom NetXtreme 57xx Gigabit
Intel Pro/Wireless 3945ABG 802.11a/b/g
TrueMobile 350 Bluetooth
Windows XP SP2
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