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A staff member has replied to your question:
Hello Wanghao,
Thank you for contacting Steam Support.
We apologize for the delay.
Please exit Steam and go to the folder called C:\Program Files\Steam\ (this is the default location for a Steam installation - if you set a different installation directory, you will need to browse to it).
Delete all of the files in this folder except:
- Steamapps and Userdata folders
- Steam.exe (this file is listed as an application and features the black and white Steam logo)
Restart your computer.
Then, launch Steam.exe from within the Steam installation folder, and not from a pre-existing shortcut.
With Steam running, re-test the original issue.
Note: This process will not affect your currently installed games.
If the issue persists, make sure your network is optimized for Steam by following the guide below:

顶，有人吗

删了他跟你说的那几个文件然后重启电脑再打开steam

Then, launch Steam.exe from within the Steam installation folder, and not from a pre-existing shortcut.
With Steam running, re-test the original issue.

猛犸：表哥，你藏野怪堆里干啥？
人马：嘘，对面巨魔出支配了，一会肯定过来打野，我二连你一个波，妥妥的！
猛犸：好是好，不过你站胖子怪堆里是不是太显眼了？
人马：你懂个毛，我这是在装有人拉了双野！
猛犸：表哥，你真是深藏功与名啊。
。。。。。
蓝胖：巨魔小心点，我身边俩二货在装野怪蹲你…另外你快回去叫人来，他俩就在我身边,我不敢动，我都吓尿了..
巨魔：好，我收完这波熊怪就去！
。。。。。
系统：熊战士击杀了巨魔战将

我看懂了～可惜好像来晚了。。。。。。。。。。。。