How many temporary internet files you accumulate depends on the size you've set your cache (and how much you surf the net). In Internet Explorer, click Tools | Internet Options... | General tab (if not already selected). Click the Settings button under Temporary Internet files. In the Temporary Internet files folder section, you can either use the slider, or type in a number, to adjust the Amount of disk space to use:. (On this machine mine is currently set to 25 MB).