Internet Explorer 8: Clicking Folder Always Opens New Window; Fix
Several users have reported an issue in which, after installation of Internet Explorer 8, clicking on any folder in Windows Explorer results in the opening of a new window, rather than navigating within the same window. The issue occurs despite users having the “Open each folder in the same window” option selected in Windows Vista’s folder options.
Fixes:
Run as admin The simplest and most commonly successful fix for this issue is to simply right-click the Internet Explorer 8 icon and select “Run as Administrator.” After doing this one time, the new-window behavior should stop.
Uninstall IE 8 If this issue becomes too irritating and the aforementioned fix doesn’t work, you can try downgrading to Internet Explorer 7.
Feedback? info@windowsfixup.com.
Filed under Internet Explorer 8, Windows Vista by on Mar 26th, 2009. Comment. 
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Comments on Internet Explorer 8: Clicking Folder Always Opens New Window; Fix
Yeah, good luck downgrading to IE7 from 8. Seriously, have you ever attempted it? I surely doubt it, as if you had you would not simply recommend it, but include the instructions on how to manually delete all remnants from all the different places on the hard drive and the registry.