I have a Compaq Presario SR1603WM...
I use DSL
No recent changes have been done to the computer...
I took it apart and reseated everything...
still not working...
I connect to the internet and it says connected but when I open a website is says
searching for site then an IP address
Then says the page cannont be displayed
Doesn't work with any other web browsers
Please HELP!What operating system do you have?

Try the following:
In Vista, press the start menu, and type:
cmd
Right click on "CMD" and click "run with Administrative..."

In XP:
Press Start, and click "Run"
type CMD and press ENTER

Now, in command prompt, type:

ipconfig /release

then

ipconfig /renew

(These are basic troubleshooting steps for NETWORK connections) That didn't work I'm using XP
I called my ISP
and they said I could be missing a file
but I have no idea what file it could be
anyone know?Missing a file?

I think they are making stuff up. Still, if they did some diagnostics through you and really did DETERMINE that that is the case somehow, you can do the following:

Have your XP CD Ready, go to the Start Menu, and Run. Type:
sfc /scannow
Click OK/Press Enter.

LIKE I said though, I doubt it will actually work, since there isnt any reason for a missing file to really be related with this issue... but, if they think so, we can prove them wrong here. Any router involved?
Wired, or wireless connection?
What browser, version? Did you try another browser?
Does "ping" command work?try using this:

http://majorgeeks.com/download4372.html

to fix a possible corrupted TCP/IP stack..Actually, the above program has two tools included:
- reset TCP/IP
- repair Winsock