Can I just I can carry on upgrading RAM, hard drives, power supply, graphics card and processor, instead of ever buying a new system? Is there anything that i can't upgrade or which is not worth upgrading?
After a recent upgrade..well a totally new rebuild,mobo/cpu/psu/ram...the only problem i had with windows was reactivating windows. Windows was tied to the mobo,but a quick phone call to Microsoft (freephone) this was quickly sorted out.
Though to answer the main question...how far do you wish to go in regarding upgrading.
How powerful do you want your system,how old is your system.
There will come a time when main components will have moved away from each other to such an extent the adding replacements bits becomes impossible. To name but a few
Memory -a 10 year old Gateway for example - memory no longer available IDE Floppy drives -all but extinct except in the USB mode ZIP drives -who sees those now? Processors to new mother boards Motherboards to older processors This will get longer. Having said that many older machines perform very well still for basic tasks -WP/Database/ Spreadsheet/basic Internet/Photo editing
So it all depends on what you expect to achieve work wise
Put it this way, I've upgraded a computer for 8 years and it's still in it's 8 year old case - but effectivly a new machine. Only thing letting it down is the graphics card now... :-P click here for a pic and you get the idea.