Tony Toews lists a number of products that purport to be able to do this at
http://www.granite.ab.ca/access/accesstovb.htm
Note, however, that most people claim these products do an incomplete job at
best. This is because there are significant differences between the controls
available for forms in Access and in VB6. In most cases, you're better off
rebuilding the form manually, although you should be able to copy-and-paste
much of the code associated with the form.