proquota.exe missing / not found error: Unavoidably PC may get infected by virus like TrojanDownloader:Win32/Cbeplay or controlled by malware like GSRegistry. After they are removed by antivirus such as Bitdefender Antivirus Plus 2012, the infected file proquota.exe would be deleted as well so that missing problem is found.

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proquota.exemissing/notfounderror:UnavoidablyPCmaygetinfectedbyviruslikeTrojanDownloader:Win32/CbeplayorcontrolledbymalwarelikeGSRegistry.AftertheyareremovedbyantivirussuchasBitdefenderAntivirusPlus2012,theinfectedfileproquota.exewouldbedeletedaswellsothatmissingproblemisfound.