If our site using RSS feed from other sites and people click links inside it then it will open the links in same Windows. it would be not good for us as website administrator. How we avoid this?

We can use External Link module to solve this.

I've installed Views modules and I found this error on my site:

Fatal error: Class 'views_handler_filter_string' not found in /home/example/public_html/modules/cck/includes/content.views.inc on line 151

Seems Views and CCK Modules got related.

To fix it you must upload the new version of CCK Modules and that works for me.

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 YouTube is the most popular video sharing site on the web. If you have a drupal site and you want to embed video content on your site so people can watch directly from your site, what can you do?

In drupal 5 you can use some methods to embed youtube video in your content. I found this article here, not detailed but I think it may be useful.