A program other than Photoshop to edit pictures?

I tried to download the Photoshop trial onto my laptop but I do not have all the requirement. The pictures I took are from a microscope and due to the program used I can only look at them in Windows Fax and Picture viewer. When I open these pictures with paint they are huge and can't be made any smaller. Is there any other trial program I could download to edit these pictures?

Thanks

A program other than Photoshop to edit pictures?live update

Try Picasa for free!

A program other than Photoshop to edit pictures?norten

Get Picasa from Google. It is great and it is FREE!
try Corel PHOTO-PAINT

it comes with the Corel Draw package which is a great software too

give it a whirl, its the best i know

cheers
You are trying to use it for some school work obviously..I would recommend going for the HP Image Zone. It usually comes with a printer but it is downloadable. It is the best u can use. Using picasa and the rest is all for fun. At the same time though u should make copies of your photos so if Image Zone doesn't do it for you Microsoft Picture it! works just as good.
I use Picasa
I don't know the specs off hand, but Gimp works similar to Photoshop.
Trust me, picasa actually slows your PC, try Paint Shop Pro by Jasc software, it's awesome.
the gimp