Problem with iexplore

hi,

i am using ie7 with win xp sp2.i have been using ie7 for few months but today i got a problem of website redirecting …whenever i typed some thing in searching engine like google.com it does give me results …
actually whenever i pressed enter key or click on search button…nothing happens …i.e new page with results is not displayed … any body know how to correctg this problem ?? i have scanned system kaspersky antivirus 2007 and adaware … :o