Can't get IE to check for default at open (5.5, SP 1)

[SwinnCL1]

We use both Netscape (4.76 ) and IE (5.5, SP1). I currently have two instances where the Properties, Program tab option for "IE should check to see whether it's the default browser" is checked, but the pop up window asking if you want to make it the default browser doesn't come up. So we can't get it to switch to IE as the default, without uninstalling Netscape. Anyone have any ideas of maybe a registry setting that is controlling this?

Thanks

[DaveA]

I found this in IE 6.0 Help using "Default

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To reset Internet Explorer settings
If you installed another Web browser after installing Internet Explorer and Internet Tools, some of your Internet Explorer settings may have changed. You can reset your Internet Explorer settings to their original defaults, including your home page and search pages, and choice of default browser, without changing your other browser's settings.
On the Tools menu, click Internet Options.
Click the Programs tab.
Click the Reset Web Settings button.
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Then enter a check in the box next to "Internet Explorer is to check to be default" or something like this.

[ileacy]

This is the same in IE5.5 and IE6.0