The removal instructions on that site are incomplete.
It's a Babylon Toolbar/Claro clone.
Download
AdwCleaner. It will remove some of the files and reset the Search page.
Delta also installs a Toolbar and Browser Helper Object in IE:
BHO: (delta Helper Object) - {C1AF5FA5-852C-4C90-812E-A7F75E011D87} - C:\Program Files (x86)\Delta\delta\1.8.8.8\bh\delta.dll
Toolbar: (Delta Toolbar) - {82E1477C-B154-48D3-9891-33D83C26BCD3} - C:\Program Files (x86)\Delta\delta\1.8.8.8\deltaTlbr.dll
They can be disabled in your add-ons.
It modifies or adds two entries in FireFox' prefs.js:
browser.search.homepage: "http://www.delta-search.com/?affID=115308&tt=261112_yh_4812_6&babsrc=HP_ss&mntrId=76e2cf1900000000000010bf48b7aaae "
browser.search.selectedEngine: "Delta Search"
Finally, 2 folders need removing:
%ProgramFiles%\Delta
%USERPROFILE%\AppData\Roaming\Delta
(information from PC Web Plus' "maxtar", who's usually right.
)
That said, I still recommend you also post in the Cleanup forum, as Delta may not be the only malware that needs removing.
-------------
Tony
CLSID List -
A Collection of Autostart Locations