Try AVAST! it is free.

also install superantispyware and malwarebytes' anti mal ware

its all free.
also use Fire fox browser.
That browser does a good job for me of keeping junk out like excessive cache and cookies. MS explorer lets all the junk in.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD