It is all about my LAN Card

Well the story goes by changing a hard Drive upgrading 40 to 80... I've
bought a new OS which is winXP: SP2 well my problem is all about my LAN Card.
I am using a CNet PRO200 Ethernet Card.... I am using a Wi-Fi as a Internet
connection, when I try to switch on my connection to the internet my LAN Card
fails to connect.... All I have to do is to uninstall my LAN Card via Device
Manager and intall it again.... If it does connect I'll do the same procedure
again.... But when I use my previous Hard Drive the LAN card operates
normally and connects me through the Internet..... My previous Hard Drive use
WinXP SP1.... and thats the whole story..
My question is.... who might causing this problem... Is it the LAN Card or
the current OS that Im using which is winXP:SP2...
Pls do answer my question.......
Thanks in advance......