Update PCI Card driver - worth it? Laptop - wireless - router configuration

I'm wondering whether it's worth it to update the PCI Card driver for my computer as outlined below.  I've just purchased a "G" series LinkSys router and I'm downloading at 1400 to 1800 KB.  (I think that's the correct terminology.)  My understanding is that anything above 2000 KB is really fast.

But changing a driver that involves a PCI Card, a wireless connection, a router and a cable modem scares me to death!

I'm not even sure I've got the correct link for the drivers.

I hope this is enough information for you to give me some advice on whether it's worth the risk to upgrade any drivers if I'm already getting 1700 to 1800 KB downloads.

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A.  Names of downloads on Toshiba's web site under Satellite A20 S207 Download Category:
1.  11-11-2003 LAN
WiFi    Atheros 802.11a/b/g WiFi driver with Cisco/WPA support for Windows XP/2000 (v2.4.2.14; 11-11-2003; 3.72M)
 
2.  11-11-2003 LAN
WiFi    Atheros WiFi Client Utility with Cisco/WPA Support for Windows XP/2000 (v2.4.2.18; 11-11-2003; 4.66M)
 

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B.  Computer Model
TOSHIBA Satellite A20 PSA20U-02HKL7
     A20-S207
Windows XP Professional Service Pack 2 (build 2600)  
System Serial Number: 73183451P


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C.  Toshiba Wireless LAN Mini PCI Card
Current Driver:
Agere Systems
Date:  6/28/02
Driver Version
7.62.0.390
???? This is the driver I'm considering upgrading ????

________
D.  Network configuration
InsightBB Cable Feed
to Motorola Shark Fin Cable Modem
  (Ethernet connects to an HP DeskTop - that I never use)
NEW!!  LinkSys G series Router
  sends wireless signal to
  Toshiba LapTop via
  Toshiba Wireless Lan Mini PCI Card

 

Thanks, April