Commit limit includes reserved pages that haven't actually been allocated yet, but these pages have to be tracked (just in case they're called in to be allocated at some future time). While 33GB commit charge is a tad large, it's not impossible (heck, 100K of that could be allocated and ~32.9GB reserved and your commit charge will be 33GB). Still sounds like something fishy's going on though, and a thorough check for newer drivers and removing any running apps that include LSPs or kernel filter drivers (like 3rd party antivirus or firewall software, some CD/DVD burning utilities, etc) might want to also be removed as a test to see if it continues as well.