Binoculars,
FBW has a valid point - has the m/b recognised the extra ram.
I specifically exclude those who use graphics-intensive programs and the like. I mean the average user, of whom I am a typical example, whose use consists mainly of surfing the net and using Office-type apps
For anyone, myself included, who uses Bill Gates Bloatware such as Windoze 98 the more ram the better. The OS loads so many programs into memory that it leaves little space for an application. It has no efficient memory management systems and as a result Windoze uses a disk swap file so that it can write part of the memory to temporary space on the disk, load data/program from the disk, work on it then save it back to the disk and reload what it originally saved. All this while you're just trying to write a letter.
The use of Orifice 97, and I still use it, can visit even more problems on your pc. If you select the standard installation then a brilliant piece of software called Fast Find is installed. This program works in the background, slowing the computer, and re-indexes the files on your hard drive. The options for this program are selectable within limits. The best option is a customised installation and deselect FF.
I would move to Linux but I could not afford to replace the software that I use. One program I use, pcb design - not graphics intensive but heavy math calcs, cost £3000+ and I would have to pay a similar amount to get a Linux version.
One day I may have to take the plunge but for now it's cheaper to use 512MB ram & leave it running while the wife takes me out for a meal.