First, read the English article below.

Specifically, you'll need to know the manufacturer's name, the type of computer, and the model number. To find this information, do the following:  Open Start  Type in system information  Click System Information  Find the "System Manufacturer", "System SKU", and "System Model" values. Go to http://www.crucial.com/usa/en/advisor in your web browser. This website will provide you with an accurate report on whether or not your RAM can be upgraded, as well as the amount and type of RAM you can use if an upgrade is possible. To do so:  Click the select manufacturer box, then click your computer's manufacturer's name (e.g., Toshiba). Click the select product line box, then click your computer's product name (e.g., Encore). Click the select model box, then click your computer's model number. It's a blue button below the model number box. On the results page, you should see three important pieces of information:   Maximum RAM - In the upper-left side of the page, you'll see a "Maximum Memory: # GB" section. The number here is the maximum amount of RAM that you can install.  Type of RAM - Below the "Compatible Memory" heading near the top of the page, you'll see one of the following types of RAM listed in the title of a RAM product: SDRAM, DDR, or RDRAM.  RAM speed - You'll see a number to the right of the RAM type (e.g., DDR3). This is the supported speed for your computer—don't deviate from this number! Once you know the type of RAM, the maximum amount that you can install, and the speed that you'll need for your computer, you can purchase your RAM from any tech department store (e.g., Best Buy) or online store (e.g., Amazon).  It's generally cheaper to buy RAM online than in-store, but tech store employees tend to understand better what kind of RAM you may need for your machine. Most computers require RAM to be installed in pairs. This means that if you want to install 8 GB of RAM, you'll need to buy two 4 GB (or four 2 GB) cards. Once you've purchased the RAM, you might want to have someone in a tech department... 

Now, please write a short abstract for it in Chinese. Abstract:
找到计算机的型号信息。 打开Crucial Memory Advisor网站。 搜索计算机型号。 单击Find Upgrade。 复查结果。 购买兼容的内存。 考虑让电脑商城的店员帮你安装内存。