Use this program from Windows. >>>
Windows Defender by Microsoft. It works on either Windows XP or Vista.
Also, you can try a program called 'Tweak UI' also from Microsoft. It's very easy to use, and you can choose what programs you want to run, and which ones you don't. You want to download the 'Tweak UI' program from here >>>
Powertoys for Windows.
Both of these programs are from Microsoft, and are easy and safe to use.
If you want some secondary applications to help clean your PC, and get rid of all the junk. Let me know, and I will post the links.