IE7 and security warning/download errors involving navcancl and ieframe.dll
You have installed the Internet Explorer cumulative update KB931768 and have previously moved your temporary internet file folder from it's default location.
You see an error like this one:
File Download - Security Warning
Do you want to save this file?
Name: navcancl
Type: Unknown File Type, 2.64KB
From: ieframe.dll
Save Cancel
FIX:
If your temporary internet files folder has been moved from its default location, move it back.
An alternative is to run IE as an Administrator (right click the IE icon, select "Run as Administrator", but I *strongly* advise against this.
***DO NOT*** uninstall the cumulative update.
While we're on the topic of the IE cache, I'll take the opportunity to remind everybody about two problems with the cache that I see far too often:
Do not use the "Automatic" cache setting - anything but that. The way the "Automatic" setting works is IE monitors how often a web page is updated. But, there is a bug in the feature in that IE will eventually decide, seemingly at random, that a page is never updated and stop checking. The only fix is to stop using the Automatic setting and empty your cache. Users of older operating systems sometimes have to delete the folders themselves using deltree to get rid of index.dat. Users of XP and later can generally delete that file from within Windows Explorer by logging in using a different admin account to that which is affected.
Check your IE cache size. Traditionally Internet Explorer has set the size of its cache as a percentage of total hard disk size. That was fine years ago, but now that hard drives are getting so large Internet Explorer can set its cache to ridiculously large sizes (2 Gig and more). This is simply too large for Internet Explorer to be able to handle. IE7 does check, and adjust, the size of the cache **the first time you click on the Browsing History Settings button, and will reduce it to 1,024Mb if larger than that, but 1,024 is still too large. Reduce the size of your IE cache to between 50 and 250 Meg.