Im fresh out of Ideas!

My program just keeps locking up on ONE type of computer. It stops responding to a HP Pavilion, It has windows 98.

The thing is, It works just fine on other computers, with windows 95, 98a and 98b!Im useing VB5pro, It locks up when its is supose to open the Main form!!! could it be an OCX? CAnd find the problem! HELP ME