Hi Windy,
Click on Start | Settings | Control Panel | Add/Remove Programs, then scroll down the list and highlight Microsoft Internet Explorer 6.0 and Internet Tools by clicking once. A button will illuminate under the list saying Add/Remove program. Click on that and then click on the option to Repair, and click OK.
If that doesn't work, then go to Start | Programs | Accessories | System Tools | System Information | Tools (On menu bar) | Internet Explorer Repair Tool and do it from there. See how you get on with that.
Cheers
Liam