To get to your Dial-Up Networking section in Windows XP, follow these simple instructions :

1. On your desktop, right-click on the "My Network Places" icon and select "Properties". 
2. From here, right-click on your SAMnet connection icon (likely named "SAMnet") and select "Properties".  
3. Click on the "Networking" tab.  
4. Be sure there is a check in the box next to "Internet Protocol (TCP/IP)".  If there is not, click the box to add a checkmark.  
5. Click on the "Settings" button. 
6. Be sure there is a check in the box next to "Enable software compression".  If there is not, click the box to add a checkmark.  Close this window. 
7. Click on the "Advanced" tab. 
8. Be sure there is a checkbox in the section marked "Internet Connection Firewall".  If there is not, click the box to add a checkmark.

That's all that you need to check in the Dial-Up Networking section.