Tracker log and IE5?

HI all, I keep finding IE5 in my Tracker Erase and CCleaner. Why since I am using IE7? See copy of recent log below:

"Erasing AutoComplete Memory < OK > Cleaning Index File: C:\Documents and Settings\Ali Williams\Local Settings\Temporary Internet Files\content.ie5\index.dat Cleaning Index File: C:\Documents and Settings\Ali Williams\Local Settings\History\History.IE5\index.dat Cleaning Index File: C:\Documents and Settings\Ali Williams\Local Settings\History\History.IE5\MSHist012007100620071 007\index.dat "

Thanks for any explanation!
Avie