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If your Windows operating system may not be updating properly via a proxy server, this instruction may help.
netsh winhttp show proxy
netsh set proxy facultyproxy.upd.edu.ph:8080
netsh winhttp show proxy
net stop wuauserv
cd %systemroot%\SoftwareDistribution
ren Download Download.old
regsvr32 %windir%\system32\wups2.dll
net start wuauserv
NET START BITS
NET START WUAUSERV
SC QUERYEX BITS
SC QUERYEX WUAUSERV