如何在电脑上打开pdf文档
在win10系统的电脑上是可以直接打开PDF格式文档来查看的。
把PDF文件拖放到电脑中的edge浏览器上，就可以使用这个浏览器打开PDF文件来浏览的。
也可以安装第三方的PDF阅读器来使用的。
电脑开关机慢是什么原因，怎么解决
“鼠标右键点击此电脑，选择属性，控制面板主页，点击硬件和声音，电源选项下方的更改电源按钮的功能，选择更改当前不可用的设置，将启动快速启动取消，保存修改。”这样子试试看行不行。
其实电脑开关机慢影响因素很多，还有可能是其他以下原因：
（1）内存不足：如果以前进入速度不慢，现在变慢，且有两条内存的话，有可能是某条内存出现故障，进入系统后检查内存容量是否与原配置一致，如果减少了则查出损坏内存并替换；如果以前也慢，则可能是内存不足，需要添加与原内存同品牌同型号内存或直接替换为大容量内存。
（2）网络连接故障：如果网络设置出现问题，可能导致系统自动搜索IP地址速度变慢，也会影响开机速度。如果这样，则需要检查并确保网络设置都能正常使用，并将本地连接设置为固定的静态IP地址。
（3）硬盘出现碎片或坏道：建议使用启动U盘启动电脑，在PE系统下使用专用工具如DISKGEN对硬盘进行检测和修复，如果坏道过多，修复无效则需要更换硬盘。
（4）开机通电自检时间过长：需要在开机时快速连按DEL键（笔记本为F2或其它热键）进入CMOS设置菜单，将机箱内部没有安装的设备检测关闭。
希望对您有所帮助。
microsoft .net framework 2.0安装不了
经查证，win xp pro和home版本有可能会出现此问题，除会发生以上现象外，当您尝试在“控制面板”中打开“管理工具”时，可能不会执行任何操作。
问题的原因在于注册表设置不正确
解决方法：
1. 开始-运行-键入 regedit-回车。
2. 找到以下注册表项：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
3. 在“注册表编辑器”的右窗格中，双击常见管理工具。
4. 在“数值数据”框中，键入以下行，然后单击确定：
%ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools
5. 在文件菜单上，单击退出以退出注册表编辑器。
6. 重启电脑。
如果以上办法无效活着在你的系统上找不到对应注册表键值时，把以下所有内容复制到文本文档，保存为注册表文件*.reg，双击导入。
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders]
“AppData“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,41,00,70,00,70,00,6c,00,69,00,63,00,61,00,74,00,69,\
00,6f,00,6e,00,20,00,44,00,61,00,74,00,61,00,00,00
“Desktop“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,4c,68,62,97,00,00
“NetHood“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,4e,00,65,00,74,00,48,00,6f,00,6f,00,64,00,00,00
“PrintHood“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,50,00,72,00,69,00,6e,00,74,00,48,00,6f,00,6f,00,64,\
00,00,00
“Programs“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,0c,30,00,5f,cb,59,0d,30,dc,83,55,53,5c,00,0b,7a,8f,\
5e,00,00
“SendTo“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,4c,\
00,45,00,25,00,5c,00,53,00,65,00,6e,00,64,00,54,00,6f,00,00,00
“Start Menu“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,\
00,4c,00,45,00,25,00,5c,00,0c,30,00,5f,cb,59,0d,30,dc,83,55,53,00,00
“Startup“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,0c,30,00,5f,cb,59,0d,30,dc,83,55,53,5c,00,0b,7a,8f,\
5e,5c,00,2f,54,a8,52,00,00
“Templates“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,54,00,65,00,6d,00,70,00,6c,00,61,00,74,00,65,00,73,\
00,00,00
“Local Settings“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,\
49,00,4c,00,45,00,25,00,5c,00,4c,00,6f,00,63,00,61,00,6c,00,20,00,53,00,65,\
00,74,00,74,00,69,00,6e,00,67,00,73,00,00,00
“Local AppData“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,\
49,00,4c,00,45,00,25,00,5c,00,4c,00,6f,00,63,00,61,00,6c,00,20,00,53,00,65,\
00,74,00,74,00,69,00,6e,00,67,00,73,00,5c,00,41,00,70,00,70,00,6c,00,69,00,\
63,00,61,00,74,00,69,00,6f,00,6e,00,20,00,44,00,61,00,74,00,61,00,00,00
“Fonts“=hex(2):43,00,3a,00,5c,00,57,00,49,00,4e,00,44,00,4f,00,57,00,53,00,5c,\
00,46,00,6f,00,6e,00,74,00,73,00,00,00
“Cache“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,4c,\
00,45,00,25,00,5c,00,4c,00,6f,00,63,00,61,00,6c,00,20,00,53,00,65,00,74,00,\
74,00,69,00,6e,00,67,00,73,00,5c,00,54,00,65,00,6d,00,70,00,6f,00,72,00,61,\
00,72,00,79,00,20,00,49,00,6e,00,74,00,65,00,72,00,6e,00,65,00,74,00,20,00,\
46,00,69,00,6c,00,65,00,73,00,00,00
“Cookies“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,43,00,6f,00,6f,00,6b,00,69,00,65,00,73,00,00,00
“History“=hex(2):25,00,55,00,53,00,45,00,52,00,50,00,52,00,4f,00,46,00,49,00,\
4c,00,45,00,25,00,5c,00,4c,00,6f,00,63,00,61,00,6c,00,20,00,53,00,65,00,74,\
00,74,00,69,00,6e,00,67,00,73,00,5c,00,48,00,69,00,73,00,74,00,6f,00,72,00,\
79,00,00,00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders]
“Common Desktop“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,00,\
50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,4c,68,62,97,00,00
“Common Start Menu“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,\
00,50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,0c,30,00,5f,cb,59,\
0d,30,dc,83,55,53,00,00
“Common Programs“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,00,\
50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,0c,30,00,5f,cb,59,0d,\
30,dc,83,55,53,5c,00,0b,7a,8f,5e,00,00
“Common Startup“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,00,\
50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,0c,30,00,5f,cb,59,0d,\
30,dc,83,55,53,5c,00,0b,7a,8f,5e,5c,00,2f,54,a8,52,00,00
“Common AppData“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,00,\
50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,41,00,70,00,70,00,6c,\
00,69,00,63,00,61,00,74,00,69,00,6f,00,6e,00,20,00,44,00,61,00,74,00,61,00,\
00,00
“Common Templates“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,\
00,50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,54,00,65,00,6d,00,\
70,00,6c,00,61,00,74,00,65,00,73,00,00,00
“Common Favorites“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,\
00,50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,46,00,61,00,76,00,\
6f,00,72,00,69,00,74,00,65,00,73,00,00,00
“Common Documents“=hex(2):25,00,41,00,4c,00,4c,00,55,00,53,00,45,00,52,00,53,\
00,50,00,52,00,4f,00,46,00,49,00,4c,00,45,00,25,00,5c,00,44,00,6f,00,63,00,\
75,00,6d,00,65,00,6e,00,74,00,73,00,00,00
-f
