How to clean cookies from Dell computer?

Method 1:

If you are using Internet Explorer 8:

- Click "Tools" in the menu bar (you may need to press the Alt key for this to display)
- Click "Delete Browsing History"

Other IE version:

- Click "Tools" in the menu bar (you may need to press the Alt key for this to display)
- Click "Internet Options"
- Go to the "General" tab
- There should be a section and a button for deleting browser history.'

Firefox:
- Tools
- Clear Recent History

Opera:
- Tools
- Delete Private Data

However, your cookies shouldn't really slow down your PC all that much. You may want to try running a virus scan or possibly defragging.

Good Luck!
Source(s):
Opera user.
Former IE user.
Former Firefox user.

Method 2:
Easy to use a software,for example, KeepPCSmooth, download from http://www.pcsmooth.com