Cant change screen resolution?

alright, so my brother totally crashed the computer but we re-installed windows xp home edition. we cant change the resolution to anything but 640 by 480. i went onto troubleshoot and it said to go under settings%26gt;%26gt;advanced, moniter%26gt;%26gt;properties but the properties button will not highlight for me to click on it!

--ive read other posts on other websites about this, and they said i can download a new setup disc or something from a website ? my brother did this once, but he ';forgot how'; please tell me how to download this for FREE. thank you so much !Cant change screen resolution?
After installing Win XP, you need to install the drivers (usually the chipset, graphics and LAN drivers). Better install the basic drivers. They are typically on the drivers CD that came w/ computer. If CD is gone, download the drivers from the Support Website of PC maker. Just open the downloaded driver and it should install automatically.

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