There are several possibilities here

1. TCP/IP Stack corrupt

You can determine if you indeed have a DNS error if you know the specific IP
address of a computer.  If you can ping the computer by its IP address, and
not the computer name, then you have a DNS problem.  If you cannot ping
using only the IP address, the problem is elsewhere.

I've found that DNS errors (along with many other TCP/IP errors) are caused
by corrupted entries within the windows registry.  Unfortunately,
reinstalling TCP/IP, DUN, etc doesn't rebuilt the registry entries for the
device.  Neither does reinstalling Windows.

I've found that rebuilding the TCP/IP stack from scratch usually fixes the
problem.  To perform a complete rebuild:

1.  Uninstall Dial-Up Networking.  Do NOT restart the system.
2.  Uninstall everything listed (services, protocols, etc) in the Network
Properties.  Again, do NOT restart the computer.
3.  Go into the registry and delete the following keys:
        HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VXD\AFVXD
        HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VXD\DHCP
        HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VXD\MSTCP
        HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VXD\Winsock
        HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VXD\Winsock2
        HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock
        HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\WinSock2

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\RemoteAccess\Authentication\SMM_Files

4.  Exit the registry editor and restart windows to a Windows Startup Disk
(don't load into windows yet).
5.  In the \windows\system directory, rename these files by doing the
following:
        ren vip.386 vip.old
        ren vtcp.386 vtcp.old
        ren vtdi.386 vtdi.old
        ren vudp.386 vudp.old
        ren vdhcp.386 vdhcp.old
        ren vnbt.386 vnbt.old

    (Note: you will need the Win98 CD to get reinstall these files again)
6.  Restart the system and boot into windows.  Reinstall DUN, your network
adapter and properties.

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