I know that all of this information has been provided before in various places, but I cannot seem to find it now. I apologize if I am just duplicating a thread or blatantly ignoring some stickied thread. However, I have seen many posts where the first response has invariably asked for more information, so here is a (somewhat) comprehensive guide to what information to give. If the problem involves the game crashing to the desktop, you might check the Crash to Desktop? Look here first. thread for suggestions or possible resolutions to your problem. If you are posting a question about a bug or technical issue, it is of great importance to try to include the following:

The version of Sim City 4 you are running (e.g. Vanilla, Rush Hour, Deluxe). The updates you have installed (if any).
A picture, if relevant. A picture is worth a thousand words. Really. If your question has to do with missing anything (textures, props, buildings), post a picture. If you are having graphical anomalies, post a picture. If the problem is happening in-game, post a picture. There is an Omnibus Article detailing how to add pictures to your post. Read it. Apply your new knowledge.
Your machines specifications. These include: Processor type and speed (e.g. Intel Pentium 4 2.6Ghz or AMD Athlon64 3000+), RAM (e.g. 256MB), Video Card type and memory amount (e.g. ATI Radeon 9600XT w/128MB), Hard drive capacity (e.g. 120GB), and (perhaps most importantly) amount of Virtual Memory (or Page File) (e.g. min 768MB, max 2048MB). All of these stats can be found by right-clicking on My Computer and selecting Properties or by clicking Start, selecting Run, typing dxdiag, and clicking OK.
Anything else that is relevant to the problem. For instance, any recently installed mods/lots/bats are probably relevant to the problem you are having. The bottom line is that the more detail you can include in your post, the more likely it is that you will receive a quick (and accurate) response to your question. Lastly, make sure that you name your topic something more descriptive than Please Help or its relatives Problem, Help and Help!!!!!!!! (I'm exaggerating, but not by much). For instance, if your problem relates to missing textures on farms that you downloaded, a good title would be Missing textures on downloaded farms, please help. Thanks for your time. If anyone has any questions or smack-downs for repeating information, feel free to PM me.