Folder contents in System32 very big.

C:\WINDOWS\system32\Microsoft\Protect\S-1-5-18\User folder has grown huge in this server. How big should that be? How can I find what is causing it to grow? Is this the result of Malware. The company supplied Security software has scanned this folder for over two days and not finished. Details app takes hours to compile the folders content data. 2 hours running have reported, General; size: 624 MB, size on disk: 6.45 GB, Contains: 1,720,000 files, and the properties app is still counting.

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