If the computer is Windows XP then go to the control panel
Start>Control Panel
Then go to the Add or Remove Programs Applet
Start>Control Panel>Add or Remove Programs
This is the tricky part. On the left side there is a section called Add/Remove Windows Components. Just click that and when the next window pops up uncheck the Internet Explorer option then click next. You can then install the version 6.
Or as everyone else already put it so nicely go to Foxfire