Start>Control Panel>System and Security>System>Device Manager>Display Adapters
It should look like this:

Mine shows Intel HD Graphics 4000, which is my graphics card.
Then you search up that graphics card on the manufactures website, and download the latest drivers for it.

Depending on what you have it may or may not be as easy to find as mine were.
However that may not be your problem at all, it may be this:
quote = console]
[Total Ram: 757 MB
[/quote]
Having about 3/4 GB of total usable RAM is probably the cause. Please be sure that you have all of your wires plugged in correctly, and that you're not running multiple unneeded programs while launching Blockland.