Almost every yahoo search result is being redirected. How to stop?

[cassie]

I'm sorry I didn't provide enough info. I just don't know what I don't know.

Below are two examples of what is happening with yahoo searches using Safari and then Firefox:

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1) Reset Safari v3.1.1 and reopened with blank page.

2) Typed in "http://www.yahoo.com/" in the address bar and then pressed return key.

3) "http://www.yahoo.com/" page came up and I did a yahoo search for "frog"

4) Results:
http://search.yahoo.com/search?p=frog&fr=yfp-t-501&toggle=1&cop=mss&ei=UTF-8

5) Top result:
Grow a Frog
Find the Perfect Toys & Activities for Your Young Explorer Here.
www.YoungExplorers.com

6) Clicked on "Grow a Frog"

7) The address bar Immediately read:
"http://www.rds.yahoo.com/_ylt=AOo........(too long to read in just a moment before new address appeared)

8) This now appeared momentarily in address bar: http://results.yahoo.com/

9) This time, rather than going to some unrelated comerce site, I got this:

Safari can’t open the page “http://bridge.admarketplace.net/xtrk.php?fs=xml8&queryid=200436281&adid=200436342&pb=861.0&cp=0.210,108902,35946124,20,pub_crss-1983,frog/l=http://rover.ebay.com/rover/1/711-1751-2978-71/1?SID=35946124-pub_crss-1983&AID=5463217&PID=2054082&loc=http%3A%2F%2Fwww.stores.ebay.com%2Fid%3D41717712” because it could not connect to the server “bridge.admarketplace.net”.

(Using a Google search for "frog", when I clicked on "Frog - Wikipedia, the free encyclopedia", it took me right to "http://en.wikipedia.org/wiki/Anuran")

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Yahoo search using FIREFOX v2.00.14

1)Starting from a reset Firefox with blank page

2) Typed in "http://www.yahoo.com/" in the address bar and then pressed return key.

3) "http://www.yahoo.com/" page came up and I did a yahoo search for "frog"

#3 Result was:

Frog - Wikipedia, the free encyclopedia
Article about frogs, amphibians in the order Anura. Find out about frogs' taxonomy, morphology and physiology, natural history, distribution, conservation status, ...
en.wikipedia.org/wiki/Frog - 131k - Cached

But when I clicked on, "Frog - Wikipedia, the free encyclopedia"

I ended up here:
http://stores.ebay.com/Colored-Precious-Gems

If I go back to the results page, and now click on a result, sometimes it will take me directly to what I expected. Yet, if I try the same link again, I might be redirected somewhere else.


(I now did a Google search for "frog" and when I clicked on "Frog - Wikipedia, the free encyclopedia", it took me right to "http://en.wikipedia.org/wiki/Anuran")

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Could my Mac be infected with something? I want to do a check but I don't have any software. Are there any good freeware applications that I can get from versiontracker.com/?

Meanwhile, I'm resetting all my passwords from a different Mac at another location.

Thanks,

Cassie
Mac Mini 1.66 Core Duo, 2 GB SDRAM
OS X 10.4.10
AT&T DSL Pro