我的C盘下好多东西，哪些是可以删除的？

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@ ECHO --------把下面这段代码复制到文本文件rem;中，然后把扩展名改为bat，双击打开就可以删rem:除所有系统垃圾项目啦，代码如下：
reM:-----------------------------------------rem:-------------
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reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /va /f
reg delete HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /va /f
reg add HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /v ctfmon.exe /d C:\WINDOWS\system32\ctfmon.exe
reg delete "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSConfig\startupreg" /f

reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSConfig\startupreg\IMJPMIG8.1"
reg add "HKEY_LOCAL