Google Search – How to Reset Layout

Each search is independent. However, from your screenshot it seems you have picked the "Dictionary" search option under "Search Tools". In this case, searching for define software will not yield any results, you would need to search just for software.

The "Reset search tools" link returns you back to normal search, clearing all the search tools options, like "Dictionary", time period, country, etc. that you have picked. In normal search you search for define software, define hardware etc.

You can use the YouTube Options extension for Chrome:

Update (2014-04-12): the YouTube Options extension for Chrome now costs $2:

"YouTube Options" cost $2.00 per month, below is a copy of the user agreement one has to confirm prior to using it.

This extension is based on a paid subscription model. It costs a flat fee of $1.99 per month, with half of all proceeds going to non-profit organizations. Why the monthly fee? YTO is a fully supported, ever-evolving product and half of the subscription fee goes toward sustaining the level of effort needed to develop quality software. But we’re not just trying to make our product better — we’re trying to make the world better, too. The other half of the subscription fee is donated to causes we believe in. Visit the SPOI site to learn about the charities we are supporting this year. For more information on the ways you can customize your YouTube experience, explore the options here, or get the full list of more than 120 configuration options on the YouTube Options site. Until you purchase a subscription license using PayPal, YouTube Option’s functionality will be disabled.

Which means I won't use it anymore.