You can have as many browser as you can shake a stick at and most of them will be fine with the web shield browser. However, AOhelL Explorer won't be supported by the web shield I believe because it is proprietary and uses different protocols.
Personally I avoid an IE browser wherever possible, only using it when absolutely essential, to me activeX, BHOs and its integration within the operating system to me make it more vulnerable than Opera or Firefox. So I would stick with Opera, possibly firefox and Ie as a last resort and leave AOhelL Explorer alone.
Given the problems you have already have I would steer clear of IE.