Hello all, Receiving very little help on this on other forums I frequent, I thought I'd try here. I hope all of this information does not overwhelm. Here it goes: Hello, The past couple days I've noticed SVCHOST.EXE start going +50 CPU. For the most part it is sustained. I have linked a screenshot of the services that are running under this instance. I am running Win 7 RC. Right now it's not at a 'sustained' 50 CPU like it was last night, but every 3 or 4 seconds, it pops back up to 50 and then down again a few second later, and iterates like that. I just did a full Avira AntiVir scan with updated signatures, nothing found. I also run Comodo Firewall with Defense+. I am looking at the "threads" of the svhost.exe, and it appears that the culprit is ntdll.dll!RtlValidateHeap+0x110 (there are 12 instances, each of which well have over 200,000,000,000 cycles after about 10 minutes of booting up; SCREENIE BELOW). The stack for one of these threads is this: ntoskrnl.exe!KeRemoveQueueEx+0x9da ntoskrnl.exe!KeWaitForMutexObject+0x7c9 ntoskrnl.exe!KeWaitForMutexObject+0x19f ntoskrnl.exe!PoStartNextPowerIrp+0x3a4 ntoskrnl.exe!IoGetSfioStreamIdentifier+0x7ad ntoskrnl.exe!KiCheckForKernelApcDelivery+0x25 ntoskrnl.exe!IoGetConfigurationInformation+0x32b57 Here's the stack of another of the threads: ntoskrnl.exe!KeRemoveQueueEx+0x9da ntoskrnl.exe!memset+0x60e ntoskrnl.exe!CcScheduleReadAhead+0x710 ntoskrnl.exe!RtlEnumerateEntryHashTable+0x311 ntdll.dll!NtOpenKeyEx+0xa kernel32.dll!LocalAlloc+0x222 kernel32.dll!RegOpenKeyExW+0x153 kernel32.dll!RegOpenKeyExW+0x1d ADVAPI32.dll!RegOpenKeyExW+0x13 I've tried a Google, but couldn't find anything conclusive. Curious if anyone may know what's up off the top of their head. Thanks!