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It runs regularly at about 7,000k and maybe a flicker of 5% CPU, but every couple of days it goes nuts and shoots up to 200,000k of memory usage and about 50% or more of CPU. A reboot fixes the issue until the next time. How do I avoid this all together?

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Which version of Windows ? –  harrymc Mar 18 '11 at 13:21
    
@Hyppy: The security subsystem is LSASS. CSRSS, "client/server runtime", handles process creation, console windows, and (some) Win32 API. –  grawity Mar 18 '11 at 16:31
    
Wow. You are completely right. It must have been too early for brain function when I wrote that. Deleted the comment to avoid confusing them :-) –  Hyppy Mar 18 '11 at 16:34

1 Answer 1

Run the SFC

Windows XP, Vista 7 how to

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Use the System File Checker tool (SFC.exe) to determine which file is causing the issue, and then replace the file. To do this, follow these steps: Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow. Type the following command, and then press ENTER: sfc /scannow The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.

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If this does not solve it, you may be infected, see this WIKI

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