Of course, just make sure you don't delete your virgin connection (in my network connections in XP)
Try someone like ukf.net for an easy to install dial up connection (I have no links to them, but I have found them reliable) and see if that manages to stay connected. If that drops out a lot too, it may well be that you have a virus that is corrupting your account details everytime you connect.
And now the standard stuff which probably sounds patronising, but isn't meant to be.....check that your antivirus software is up to date and that your firewall is on. Do a full scan, run adaware, spybot etc etc.