XP SP2 and dial-up problem

Hi guys!

I'm using sevral ISPs all dial-up. Back then, I had no problems before shifting to Windows XP SP2. (I was on 98 then).

However, when I did, after a few days, I noticed that whenever I use an ISP (any of them) and get disconnected, I can never reconnect back. Basically, the handshaking works fine and I'm "successfully" connected and the two little PCs pop up in the system tray. However, the connection's pretty much dead. I can't do anything.

Even if I use ISP1 then reconnect with ISP2, it still doesn't work. Can someone help me with this? I looked up this problem in the internet, but the problems others had were flat out the inability to connect at all. Mine stays fine only until it gets disconnected one way or another.

I thought that maybe it was a program or config change I did that broke it. So I created a clean Ghost image and installed stuff, implementing my config changes, rebooting... etc. After days of agonizing tracking, it seems as of it simply breaks for no reason at all. For example, I installed my antivirus software then rebooted 3 times, connecting/reconnecting on each reboot. After the 3rd (no, it's not a consistent number) the reconnect just breaks.

Anybody ever had this problem? It's driving me nuts!

Thanks guys!