When your home page is changed to www1.search-results.com it is very likely that you have installed any of the toolbars or browser extensions developed by IAC Search & Media. As far as security is concerned, www1.search-results.com is practically the same as www.search-results.com, and so it is safe to assume that one of the toolbars responsible for changing your home page to www1.search-results.com is Search Results Toolbar. However, there are many other toolbars related to this website. That would include Searchnu Toolbar and even Bandoo Toolbar, but the most important thing is that these browser plugins seldom enter the PC without your knowledge.
Most often your home page is changed to www1.search-results.com, because you have downloaded and installed a particular IAC Search & Media toolbar bundled with other free software applications from a third party website. Perhaps you have gone through the installation yourself without even realizing. It happens, because users want to install software as fast as possible, and they seldom read what installation wizard has to say to them thoroughly.
www1.search-results.com itself functions as a customized search engine website. It allows you to specify what kind of search you want to proceed with - Web search, Image or Videos. However, if you try using the Web mode you are directed to an error page (www1.search-results.com/error), the same can be applied to Image and Video search. As it is obvious that this search engine cannot function properly, it does strikes as a suspicious website, and you should restore your default browser settings in order to avoid any possible malware infections.
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After manual removal perform a full system scan with SpyHunter free scanner, to make sure that no residual files remain in your system. Protect your PC from cyber threats.