Just got a cheapo new PC but it has no graphics package on it - unless you count MS Paint!

I need a package that can resize pictures, save in various formats, and do very basic editing. I'm sure a search on Google would bring in hundreds of results, but has anyone any experience with a good freeware or shareware package available on the net?
I'm not tight - honest. It's just I only save images and resize them for use on my website - nothing fancy. If you have any recommendations, please let me know. Ta muchly!

Oh, and while I'm here, now I'm all broadbanded in the Bell Mansion, anyone know where I can get some classic platformers to play on the PC? I'm thinking original Sonic, Mario Bros., Rolo to the Rescue (!!), Mickey's Castle of Illusion, etc?