localhost in weblogs

i have been looking at my web logs and getting a lot of traffic from localhost
see below

GET /rd/Clk.jsp?s=mg&k=part+tacoma+toyota&lnk2=rhhE%3F..pAspl%27Btgeel%27pDB.ExeyiAhy%27zyE%3EEkxhCexsq%3D992HH4%29jeCqDxmq%3DMM8M2G%29htEe%3DG%29pDqe%3DGLL1G498%29xkhe%3D68MH4G%29px%3DLGGH4GH4G%29qDBksC%3DrhhE%3F..vvv%27lDChxkokCq%27pDB%295iext%3D9G9G98L8L881M%23HK%23HK66%2714%27GH1%2791%23HK%23HKEkxh%26hkpDBk%26hDtDhk%29xCl%3D9%29hyyhkgsq%3DH2M%29geDhkgsq%3D69LH%29ixA%3DrhhE%23HK%23Gc%23GckqyexjsCg%27BiEEehsyB%27pDB%23Gcewhxefexxex982%27ErE%7C2%27226&p=63222&sid=27999&ex=1212184844366&snid=58 HTTP/1.1" 404 450 "http://99looks.net/search.php?q=part+tacoma+toyota&said=3" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; en) Opera 9.21"

is this a script kiddy
or has machine (windows xp home sp2 with avast and avg) be compromised?

Do you have an ad script on your site?

no nothing at all like that
this is one example