...or just get a perpetual license of Photoline for $70. Which still even runs on Win2000, and a download of a ~30mb installation file. And in terms of image editing would be on par with Photoshop (standard), and more than enough for what the OP would require.
Even Gimp (free) would be overkill for those requirements.
Photoshop is not always the best answer. Especially for web export.