Having returned to flight sim after around a 5 year break, I have installed FSX along with a few addons. 737, Airbus and 767 etc. I have a fairly well specced PC and seem to get the 20fps that it is preset to by default. However, I am sure this 20fps is acheived at a price and my visuals etc are suffering. This is not too bad flying at 30,000 feet when there isnt much to see. But as I am interested in general aviation as well, I thought installing FS2004 to use for that sort of thing. Is this a good idea? will they coexist happily. I bought FS2004 when it first came out, just didnt install it. I think what I am trying to do is find out what route people with more experience would take.

FSX and FSX will happily co-exist on the same PC. I run each on a separate dedicated partition just purely to keep things isolated and get a small (theoretical) performance boost.Sometimes the registry might get a bit confused but Flight1 make a small registry repair tool that fixes things with one click. Generally though, there should be no problem.

Agreed, you should not have any major issues with this, lots of users (including myself) enjoy both platforms.-Brad

Thanks folks, the reassurances are much appreciated. I don't think I will partition though.

No need for partitions, they are distinct installs and run fine from their own directory.