I'm not sure what you mean by dial up connection panel & I don't know your OS. If it's XP try this
Control panel/network connections/ right click on your default connection/properties/click the options tab/ make sure there is a tick in Display progress while connecting.If you have no connection showing
Omit the quote marks & remember the spaces
Open the CMD Prompt from the start menu or go torun & type "cmd" at the prompt type "cd\windows\system32" press enter
Next type "regsvr32 netman.dll" press enter
Then Type "regsvr32 netcfgx.dll" press enter
Then type "regsvr32 netshell.dll" press enter
After each time you press enter you should get a message Succeeded
Type "Exit" Press enter
Restart your computer.
If you are not on Windows XP or you have a different problem I'm not sure this will help.
Make a backup before you start in case of erroors I hope this will help.