I'm sure that info will help others who may be more informed than me, Ryan_paco.
I'm not a techie but it seems to me your system is rather underpowered for this game, most notably the 256MB RAM; most of this will get used up by Windows itself, leaving very little, if any left over to run the game (if and when you get it running, of course!). You should look into your virtual memory settings straight away and set your page file minimum AND maximum to 1500MB (I think those are the recommended settings anyway - check other threads here for confirmation). Unfortunately the game will probably run like treacle on all but the smaller maps with so little 'real' memory available to it. The 1.52 patch is supposed to be a big help with minimum PC's like yours so installing this is another high priority I would say. Upgrading your RAM to at least 500MB would be a significant improvement if you can afford it, not only for running the game but for everything else on your computer. 1GB would be even better.
Your graphics card is at the low end too, memory wise, but may well work OK (I have the same card but with twice the onboard memory) - have you downloaded and installed the latest drivers from nVidia? If not then try them, the game requires certain functions that may not be present if your drivers are out of date. If the new driver makes matters worse you can always roll back to an earlier version.
As for your unzipping error it sounds to me rather like a corrupt or incomplete zip file. You should try and download a fresh copy of the patch, avoiding the use of any download accelerators if you have one. If you scout around these forums a bit I'm sure you will find a link or three to the patch as an .exe file rather than a zip - you might possibly have more luck with that.
This is probably the extent of the advice I can give right now. In summary your primary tasks should be: check/adjust your virtual memory settings, upgrade your video drivers and get a good copy of the latest patch.
You could also do some basic disk maintenance - make sure you have a good amount of free space and defragment your hard drive to give yourself the best possible chance of success.
I'm not sure about your Windows version - does that include updates to SP2? I believe I have read somewhere that you need SP2 because it includes some of the latest graphical advances that this game requires.
You have a little work ahead of you so good luck!
PS. Your computer clock is wrong, unless you are speaking to us from 11 yrs into the future. 
