Photoshop CS2 won't save files in JPEG format

I have Windows Vista and am using Photoshop CS2 Version 9. Until today everything was working fine, but there are two problems.

1. Only today I have a limited amount of formats to save a .PSD file in: PSD, CIN, PDF, RAW, PNG, and TIFF.
Whereas if I want to save a JPEG file per say as another format, I get the full list to choose from.

2. If I choose a layer on an image, not all the filters show up that I can run it through. The 'Artistic, Brush Strokes, Pixelate, Sketch, and Stylize' are not clickable.

Thank you.

You slipped into 16 bit mode. Try going back to 8 bit.

Thank you so much. I didn't realise I did this.