linksys software HELP!!

okay, this is probably going to be long, but i really really need your help.

i have a dell dimension 4600, that i've had for almost two years now. when i first got it, i had a linksys wireless adapter put on it (i don't konw the model number).
anyway, i use this machine both at school (where i can use their dsl) and here at my dad's house (where he has wireless dsl).

here's the problem:
somehow, along the course of cleaning things up, or moving things around, i must have gotten rid of my linksys software on my computer. i dont' know how, but it certainly isn't here.
so i can't set up a wireless connection, becaue my computer doesn't even realize that it has an adapter already on it!!

so i guess i need the software for this unknown linksys model. but i don't know how to get it. i usually keep all my discs in one space, but i've moved so many times since i first put it in, i must hvae lost it.
but i need to be able to recieve wireless!~!~!
AHHHH, can anyone help?
i'm going crazy using my dad's ancient ibm laptop!!
any advice is appreciated.

THANKS A MILLION!

 

1. Are you using Windows XP?

2. Find out the model number, that's probably your only way of obtaining the software through the official site.

 

1. yes, i am using xp.

2. how do i find out the model number?

3. i've been to the linksys site. but when i thougt i found something that looked like it was my adapter ( the WMP55AG Dual-Band Wireless A+G PCI Adapter). and i downloaded it, it just iddn't work. i installed it on my computer, but nothing happened.

thanks so far.
any other advice?

 

okay, i'm getting a lot closer to solving all of this (thanks to all of your help).
but i don't have a "Wireless Network Connection" icon in my Network Connections!!
i don't see how i don't, considering i have a wireless network adapter and have had this icon in the past, but for some reason, now i don't! can any tell me how to get this??
thanks

 

there is an exclamation point, what does this mean?

 

oh, okay, i'm getting a lot closer.

i think i have almost everything i need..... but....
does anyone know where i can download a file called "LSIPNDSX.sys"??

i think that once ihave this i can update my device driver and then i'll be good to go.
anybody know?