Tests and Scans
TIP > Internet Explorer Cache Overflow
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About IE Cache Overflow
Systems with a cache overflow act erratically when browsing the internet. Microsoft documents several of these problems, such as 306907 and 260650, that you might not associate with a full cache. Since many portions of Internet Explorer are integrated into the operating system, it can cause other applications to behave erratically as well. For example, an attachment may not open in Outlook when the IE cache overflows.
PC Pitstop Optimize 3.0 can find and remove files that are
left behind by interrupted program installations, system crashes, and browser cache bugs.
All versions of Internet Explorer have a bug in the way they handle the browser cache. In some circumstances, such as when a page isn't fully loaded because you press the stop button, IE will not update its cache information but does not delete the partial file. IE has lost track of these files, and they will not be deleted if you clear the cache through IE's menu option (Tools | Internet Options | General tab | Delete Files). You can demonstrate this by using the menu delete option and retesting; you will probably still see several megabytes of disk space being used by your IE cache.
For manual deletion, use this method:
In some cases, the IE cache index (INDEX.DAT) file may be damaged and should be deleted. Microsoft documents 306837 and 293402 have additional information on symptoms of the problem and how to remove the file.