Hi Cathy,
Computer brands are a little like editors; they are very much down to personal choice (do you like the look of it, how many sockets does it have, do you have a good/bad experience of a particular make etc) but if you take the specification that Col listed in his other thread and pop along to a reputable shop, such as PC World, they should be able to advise you.
My last 2 PC's have come from PC World, but no-one please laugh - I have a local store with knowledgeable staff. I used a Fujitsu Siemens PC for 7 years (and could edit Full HD on Windows XP, 2GB RAM with a single core 3GHz processor) but for the last 2 or 3 years I have used an HP Pavilion with i7-2600 quad core @ 3.40GHz, 8GB RAM and Windows 7. Works a treat. I paid extra for the 5 year warranty (which I've never needed) but that also gives free labour on upgrades: If you want to upgrade RAM or add an extra drive, buy it from their shop and they will install it and set it up for free.
I've only ever used 2 hard drives (can't afford the luxury of 3 or 4) one is the system drive and the other contains all my work. I regularly back up the entire 'work' drive onto a pair of external hard drives as it's the original drive from the Fujitsu Siemens so it's about 10 years old. Still working fine.
Col's specification is for a high grade system and if you can justify the expense of a PC of that spec then you're good to go. But you don't need a Ferrari to go to the supermarket, and you might find that you can get away with a slightly lower spec. Don't skimp on the processor though (get at least an i7 not an i5) because that's the hardest component to upgrade. You can always add extra RAM, a bigger or more hard drives, graphics boards etc. You will need at least 8GB RAM (Windows takes about half of that just to sit there and do nothing) but you might not need an expensive graphics card. I don't have one fitted, and never have had, although I concede the system might work faster with one fitted (I did actually install a mid-priced graphics card at one time but the system and graphics rendering ran
slower than it did with the on-board graphics so I ditched it!)
I use the Sony Vegas Movie Studio series, which are renowned for using very little resources when running. Adobe products on the other had are renowned for using a great deal more, so it's entirely feasible that if I were to run Premier Elements on my system, it would run a little slower than Movie Studio does. You mentioned in your other post about rendering times of an hour for a 12 minute film, but that's a bit like 'how long is a piece of string?' Rendering time varies dramatically depending on the complexity of the timeline, special effects, added colour grading plug-ins, how many video and audio tracks you have stacked up etc, and my rendering times are nowhere near yours (mine are slower). But, that doesn't bother me at all - if I want to check out the look of a particular edit or section, I'll just render that section on its own for review. And to set off the PC for an hour or two to render the final edit whilst I go and mow the lawn after spending three months working on a film, is no great hardship for me
Hope this helps, and good luck!
PS: I am
not a computer expert!