update README.*

README.md

@@ -103,6 +103,36 @@ Fork me on GitHub: <https://github.com/soimort/you-get>
 
    Click [here](https://aur.archlinux.org/packages.php\?ID=62576).
 
+### FAQ (For Windows Users)
+
+* Q: I don't know how to install it on Windows.
+
+* A: Then don't do it. Just put your `you-get` folder into system `%PATH%`.
+
+* Q: I got something like `UnicodeDecodeError: 'gbk' codec can't decode byte 0xb0 in position 1012: illegal multibyte sequence`.
+
+* A: Run `set PYTHONIOENCODING=utf-8`.
+
+## Upgrading
+
+Using Pip:
+
+    $ pip install --upgrade you-get
+
+### Error When Upgrading from Pip
+
+If you see this error:
+
+```
+  File "/usr/lib/python3.3/site-packages/pip-1.2.1-py3.3.egg/pip/backwardcompat.py", line 44, in u
+    return s.decode('utf-8')
+UnicodeDecodeError: 'utf-8' codec can't decode byte 0xae in position 68: invalid start byte
+```
+
+This is an existing bug in Pip 1.2.1. However, this does not affect your upgrading.
+
+In Pip 1.3+, this should be already fixed.
+
 ## Examples (For End-Users)
 
 Display the information of the video without downloading:
@@ -297,6 +327,36 @@ You-Get基于优酷下载脚本[iambus/youku-lixian](https://github.com/iambus/y
 
    点击[这里](https://aur.archlinux.org/packages.php\?ID=62576)。
 
+### FAQ（针对Windows用户)
+
+* Q：我不知道该如何在Windows下安装。
+
+* A：不需要安装。直接把`you-get`目录放到系统`%PATH%`中。
+
+* Q：出现错误提示`UnicodeDecodeError: 'gbk' codec can't decode byte 0xb0 in position 1012: illegal multibyte sequence`。
+
+* A：执行`set PYTHONIOENCODING=utf-8`。
+
+## 升级
+
+使用Pip：
+
+    $ pip install --upgrade you-get
+
+### 从Pip升级时可能的错误
+
+若出现以下错误提示：
+
+```
+  File "/usr/lib/python3.3/site-packages/pip-1.2.1-py3.3.egg/pip/backwardcompat.py", line 44, in u
+    return s.decode('utf-8')
+UnicodeDecodeError: 'utf-8' codec can't decode byte 0xae in position 68: invalid start byte
+```
+
+这被证实是Pip 1.2.1的一个bug。不过，它并不影响到正常的升级。
+
+这在Pip 1.3+中应当已经被修复。
+
 ## 使用方法示例
 
 ### 如何下载视频