To be of help in dianosing this High CPU usage problem, I am submitting the files from my system. My PC OS is XP SP3, CPU is AMD Athlon 64 3800, 2 GB ram, system board KN8 SLI, and 2 114 GB drives. My PC will have 99% CPU usage by mbamservice.exe for about 4 minutes after booting from power off. If I boot up from standby is high CPU usage does not occur. The PC is fast, up to date, clean and a pleasure to use. The only other virus type software being used with Malwarebytes is Spybot S&D and Spywareblaster. I have run this PC with these 3 softwares for years with excellent results. The High CPU usage started about 2 or 3 weeks ago. I believe it was when MB updated to version 1.75. Here are my files, Thanks for any help, Rob dds.txt attach.txt CheckResults.txt