Image upload issue (WP 2.2)

When I try to upload images, some of them get uploaded, most of them not. I don’t think it has anything to do with size, because they are not bigger than 200kb. And sometimes larger images get uploaded and smaller ones not – so that can’t be the problem.

When I hit the ‘Upload’-button the progressbar of my browses shoots off, but keeps hanging at a certain point. And there it keeps hanging, until I get the message in from my browser in the upload-box:

Connection reset/re-initialised.

I’m using WinXP, Firefox (same issue on IE), Norton AV (Turned Auto-protection off for 15 minutes, didn’t help) and my ISP is bloody skynet.be.

Uploading 6 pictures takes me about an hour. So I better do this this the manual way, don’t you think?