I just did, I still get the same pop-up and now get the following error
protocol:

HTTrack3.43+htsswf+htsjava launched on Sun, 12 Oct 2008 22:44:10 at
<http://www.questia.com/> +*.png +*.gif +*.jpg +*.css +*.js
-ad.doubleclick.net/* -mime:application/foobar
(winhttrack -qwC2%Ps2u1%s%uN0%I0p3DaK0H0%kf2A25000%f#f -F "Mozilla/4.5
(compatible; HTTrack 3.0x; Windows 98)" -%F "<!-- Mirrored from %s%s by
HTTrack Website Copier/3.x [XR&CO'2008], %s -->" -%l "nl, en, *"
<http://www.questia.com/> -O1 "C:\Mijn Web paginas\Questia" +*.png +*.gif +*.jpg
+*.css +*.js -ad.doubleclick.net/* -mime:application/foobar )
Information, Warnings and Errors reported for this mirror:
note: the hts-log.txt file, and hts-cache folder, may contain sensitive
information,
 such as username/password authentication for websites mirrored in this
project
 do not share these files/folders if you want these information to remain
private
22:44:11 Info:  Note: due to www.questia.com remote robots.txt rules, links
begining with these path will be forbidden: /pageView/, /pageView/htmlreader/
(see in the options to disable this)
22:44:11 Warning:  File not parsed, looks like binary: www.questia.com/
22:44:11 Error:  "Open error when decompressing" (-1) at link www.questia.com/
(from primary/primary)
22:44:11 Info:  No data seems to have been transfered during this session! :
restoring previous one!


Even though it didn't solve this problem, I thank you for your advice and hope
more people will give some.