I had this problem recently. Suggested Sites was my problem in IE8. This is what I did:
0. Make sure that IE8 IS NOT OPEN!
1. Go to your Control Panel in Windows and Open Internet Options.
2. Under Advanced (Top Right) Make sure that "Enable Suggested Sites" is NOT Checked.
3. Click Apply on the Bottom Right Corner
4. Click on General (Top Left) under Browser History, click "Delete"
5. Check all the Options in the window and then click "Delete"
6. After its done it's thing close Internet Options.
Rerun CCleaner. The 5.28mb should be gone...