For those who want to use the mouse scroll in visual basic 6.0 please follow the steps below :http://www.blogger.com/img/blank.gif
* Download the VB6 Mouse Wheel.exe file here.
* Click Start, click Run, type regsvr32 \VB6IDEMouseWheelAddin.dll, then click OK.
* Start Visual Basic 6.0
* Click Add-Ins, and then click Add-in Manager.
* In the Add-in Manager list, click MouseWheel Fix.
* Click Loaded / Unloaded check box, then click the Load on Startup check box.
* Click OK.
source : http://sigitnote.wordpress.com/2011/01/15/menggunakan-scroll-mouse-di-visual-basic-6-0/
If not successful please visit this page http://support.microsoft.com/kb/837910