satyamy said:this same thing happend to me also one time
for this
go to ur control panel & in add remove programme find out their must be some new software installed, (may me its name is search bar, safe search or something like that)remove that
& after that search ur OS drive (normally C:\) for that named files (which was the name of that programme you removed)
& delete all the files & folder with that name
also search in registry
After this just do a virus scan