On one of my WinXP Pro machines, I've been running MalwareBytes for years (Pro version). For quite a while, svchost.exe has steadily consumed more and more memory until eventually a restart is required to reset its usage. I've finally narrowed it down to the MBAMService service. Stopping that resolves the issue. I had one daily update scheduled, a weekly full scan, and daily quick scan. Flash scan upon update was not enabled. I have not witnessed the problem on my Windows 7 Home Premium PC. Nor have I noticed this problem elsewhere. Note, just because it's an issue with "svchost.exe", this does not pertain to the "svchost.exe" trojan - sorry if your search for that brought you here. Thoughts?