sunny,

>No, I didn't install VS6 on Dells. And I didn't put the dial-up into startup directory.

Here's the section from the VS6 install.htm file, you might want to check these registry entries to see if they are what's causing your dial-up at boot time:

An Internet Connection Dialog Box May Appear at Startup of Windows or Other Applications
If remote connections are enabled in Windows 95 or Windows 98, the system may try to initiate an Internet connection at Windows startup or at the start of many applications. This behavior is sometimes called "autodial" or "autoconnect." You can turn off this behavior by setting the registry key EnableRemoteConnect to "N."

To do this, create a text file "DisbleAutoConnect.reg" with exactly the following three lines:

REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLE]
"EnableRemoteConnect"="N"
Changing this setting to disable remote connections should not prevent any of your normal Internet activities, and this setting is the default for most systems. However, enabling remote connections is necessary for some features of DCOM (see http://support.microsoft.com/support/kb/articles/Q177/3/94.asp).

If there are instances when you need to have remote connections enabled, create a second REG file, "EnableRemoteConnect.reg", with exactly the following 3 lines:

REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLE]
"EnableRemoteConnect"="Y"
Run "EnableAutoConnect.reg" to make the setting, and then run "DisbleAutoConnect.reg" to disable it when autoconnect is no longer needed.