Hi neilfp, delta-search.com is a browser hijacker which is promoted using free software downloads. Computer users should be very careful when downloading freeware - many download websites (softonic.com, filewin.com, download.com, etc.) are using download clients which offer (sometimes in a very deceptive way) additional program installation together with the chosen free software. When downloading free software be sure to choose "advanced" or "custom" installation options instead of "typical" or "quick" - this will allow to opt-out installation of additional browser add-ons, toolbars, etc.

Delta-search.com keeps coming back as one's Internet browsers homepage, because it's "protected" by "delta helper object". Prior to changing your homepage or default search engine be sure to remove this browser add-on. Follow this removal guide.