如果真的是以前正常的话，建议你检查下你的CPU风扇，看看是否坏了。
至于安装多个播放器使用率100%的问题，你把他们的随系统启动的项目关了，要使用那个软件的时候在启动，这样应该能好很多。
把下面的存为：清理系统启动项.bat
@ ECHO OFF
@ ECHO.
@ ECHO. 说 明
@ ECHO --------------------------------------------------------------
@ ECHO 本批处理会自动清理所有非必要的启动项目，仅保留输入法(ctfmon)。
@ ECHO 目的是减少不必要的资源占用，使系统运行顺畅。但清理掉的项目不作
@ ECHO 备份，请小心使用。 《GhostXP电脑公司特别版》作者编。
@ ECHO --------------------------------------------------------------
PAUSE
reg delete HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun /va /f
reg delete HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun /va /f
reg add HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun /v ctfmon.exe /d C:WINDOWSsystem32ctfmon.exe
reg delete HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupreg /f
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregIMJPMIG8.1
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregIMJPMIG8.1 /v command /d C:WINDOWSIMEimjp8_1IMJPMIG.EXE /Spoil /RemAdvDef /Migration32
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregIMJPMIG8.1 /v hkey /d HKLM
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregIMJPMIG8.1 /v inimapping /d 0
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregIMJPMIG8.1 /v item /d IMJPMIG
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregIMJPMIG8.1 /v key /d SOFTWAREMicrosoftWindowsCurrentVersionRun
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002A
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002A /v command /d C:WINDOWSsystem32IMETINTLGNTTINTSETP.EXE /IMEName
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002A /v hkey /d HKLM
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002A /v inimapping /d 0
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002A /v item /d TINTSETP
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002A /v key /d SOFTWAREMicrosoftWindowsCurrentVersionRun
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002ASync
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002ASync /v command /d C:WINDOWSIMEimjp8_1IMJPMIG.EXE /Spoil /RemAdvDef /Migration32
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002ASync /v hkey /d HKLM
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002ASync /v inimapping /d 0
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002ASync /v item /d TINTSETP
reg add HKEY_LOCAL_MACHINESOFTWAREMicrosoftShared ToolsMSConfigstartupregPHIME2002ASync /v key /d SOFTWAREMicrosoftWindowsCurrentVersionRun
del C:Documents and SettingsAll Users「开始」菜单程序启动*.* /q /f
del C:Documents and SettingsDefault User「开始」菜单程序启动*.* /q /f
del %userprofile%「开始」菜单程序启动*.* /q /f
start C:WINDOWSpchealthhelpctrinariesmsconfig.exe