Problem with BHO under Vista with IE7

I have created Browser Helper Object. It works fine on IE7, IE8 and IE9. The problem is that on IE7 in add-on list my BHO has empty Publisher field. On IE8 and IE9 Publisher field is not empty and has correct value. Why IE7 does not display publisher field? I have specified publisher's name in AssemblyComapny attribute of my assembly:

[assembly: AssemblyCompany("My Company Name")]

Is there any way to solve this problem? I have no idea what can be wrong with it...