Raw file conversion Problem

Have a Fuji S2 digital camera. When i use the Adobe plug in to convert the raw file it does it at 3024 x 2016. When i use Fuji's own software the conversion is done at 4256 x 2848 which is better. Adobe's software lets me raise or lower the conversion rate but i would like to know if this changes the quality? Is there any way to do the coversion at fuji's setting of 4256 x 2848 on Adobe's software without a quality loss? Using photoshop 7 on my windows xp system

Thank You
George

Yes, it changes the quality when you resample -- but Fuji's software is already resampling by default (the camera only has 6 megapixels).