How do i download themes for windows vista basic and where do i download them to?

HI,

You can download them free from this site:
http://vista-themes.net/
Kindly note that it is always advised to have an antivirus on the computer to ensure safe internet browsing experience.

Once you have selected the theme that you require, download and save it on any folder you may desire.
Once the download is finished, go to the location of the file and execute the theme file.
It may start an installer, allow it.
once the theme is installed,
Goto control panel.
click "personalization"
Then Click on "Theme".
you will find a pop up window. In that window click the Theme Drop down.

Select the newly installed file and it will change the layout of your computer.

Once done, dont forget to click "Apply" and then "OK".

Hope this works for you.

Best Regards,
Techno-Geek.