What is the best way to remove unwanted cookies from my computer?

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I recommend that you could use a program named "Clean Up!". I have used it for 163runs and it managed to save me 21GB space. The software is free. Visit to http://cleanup.stevengould.org...Show more

A cookie distinction should be made:
"1st party" cookie "assets" are from the site you ask the browser to 'fetch'. They are usually helpful, usually harmless and are often required to view and interact with the site.
It's actually better to keep these oft' visited site cookies, because they save your site settings, preferences, and other related things, so exclude them from cleaning with any utilities, like Glary Utilities, CCleaner, or clearing "when browser closes" (a browser setting).
When maximum cloaked discretion is required, use the "Private browsing" feature of your browser.

Cookie "assets" that make trouble and are not helpful are from 3rd parties; usually advertising, almost certainly 'tracking' ability, and sometimes downright evil (as in 'malware' infested). http://www.newsfactor.com/story.xhtml?story_id=73047

Your primary strategy should be to stop those 3rd party 'assets' from even getting inside your system in the first place; then fall back to removal tactics with a 'scrubber', such as "CCleaner" or "Glary Utilities" (for the less evil 'stuff'); and a malware remover such as "MalwareBytes" http://www.malwarebytes.org/ for the really bad stuff.

Start by getting Firefox as your default browser & use it for everyday surfing; fall back to IE only for "last resort" viewing of substandard websites & Windows updates.
The following tips help, but methods (vectors) constantly change.

►FIREFOX: Tools> Options> Privacy> top slot, drop menu, tick "Firefox will use custom settings..."> Check 'Accept Cookies from sites'
& ►► Un-Check 'Accept 3rd Party cookies'
My recommended Firefox Collection, for improved security, and a tad bit of 'appearance' mod's.
https://addons.mozilla.org/collections/dunbar-pappy/dunbarpappy/
which includes flash cookie blocker.
At minimum get "NoScript" which blocks scripted assets (and scads of leverage vectors) until you allow them...much better than trying to get rid of malware picked up by global allowance.

IE does not have exceptional "3rd party" blocking. For that reason, and many other security related ones (especially 'active scripting' rubbish), it should not be used except for sub-standard websites or Windows updates...but if you must know:
INTERNET EXPLORER: Tools> Internet Options> Privacy> Advanced:
here check 'Override automatic....'; 'Allow session cookies'; 'Allow 1st party cookies' & 'Block 3rd Party Cookies'.

Newest browser versions have a "DNT" (Do Not Track) feature, but until it's empowered by law: it's pretty much a toothless option....Show more

Okay, this is gonna seem foolish, and sound like a virus. But I recommend advanced system care from downloads.com (cnet.com) it clears unwanted cookies, (spyware removal) and a few other great options....Show more

Click on Disk clean up...Show more

You can control which cookies to save (login, yahoo...etc) and which ones you don't want saved....

http://download.cnet.com/ccleaner/

After you install this...click on settings...then click on the cookies tab...and there you control the cookies you want to keep........Show more