Win7. Sp1. I've installed all updates. Sometimes other files grow. Once ekm.exe grew to 200 MG. I have to watch task manager and delete svchost.exe or dllhost.exe when they start getting too big. When ekm.exe bloated I had to reboot.
ESET doesn't detect any malware. I have updated and scanned all disks. svchost.exe grows to several hundred MB. Once it reached 9 GB before I deleted it in task manager.