Hi Mary Ann and welcome to the site.

What type of logo are you looking to have?

If it is graphic based and you have a relatively new computer you should have built in software that will allow you to do it fairly easy.

If you are just looking for something free that is a company name you could check out cooltext.com as they have a pretty neat logo creator with a bunch of options. You could play around with the different options and make one relatively quickly and dl to your PC.

Other than that I do not know of any services as I do not pay for any type of graphic or logo work. sorry.

Hope this helps though.