Two ways to find out what hardware you have.
1) Start->Control Panel->System and select the Device manager tab, then look under the display adapters. It may not say nvidia and may not mention which chipset, but should say the model number which can be helpful.
2) Right clicking on the desktop background and selecting properties (or Start->Control Panel->Display properties), then selecting the settings tab and clicking then 'advanced' options button should bring up a new window.
At the top will be a set of tabs (
Example from Windows XP). One of them will show a window very similar to that shown in the example (every graphics card I have come across that uses an nvidia graphics chip has always kept to this type of layout) which should hopefully give you the info you want.
Now, for compressed folders, if it is installed just double-clicking on the zip file should allow you to view its contents and copy its files out of the zip file itself (you will need to copy them out to actually be able to use them)