Google Search Hijack and Redirected to Unwanted sites

These are on the increase and getting more common these days. Users who use the Google search engine may complain of having their search redirected to unwanted sites, regardless of what browser is used. This happens when the system is infected with any of these variants; Trojan Win32/Daonol.A/B, Trojan.JSRedir/Trojan.Gumblar, Win32.Alureon, Win32.Olmarik, Trojan.generic, TDSS rootkits, Backdoor.Tidserv!.inf.