Go to My Computer, View, Folder Options (or Control Panel, folder options depending on your operating system. Turn on the option to "show hidden files and folders". Create a temp folder named "Old_IE_uninstall". Go to folder C:/Program Files/Internet Explorer/Uninstall Information. Go to Edit, Select All, Cut all files. Open "Old_IE_uninstall" folder and paste the files just cut. Try the IE install again. If the install works for you now, you can rename the "Old_IE6_Uninstall" folder, and then delete if things continue to work properly.