Hi, I am having serious trouble with regular (15 second) CPU spiking which I believe is the cause of my audio drop outs and clicks. I cannot seems to find a solution. My system is Toshiba Satellite L450-17L / Windows 7 Home Premium 64-bit / Intel Celeron CPU 900 2.2GHz / 4GB RAM / Mobile Intel* GMA 4500M. Running Traktor Scratch Duo 2 with Audio 6. Technics 1210 Mk2 / Allen & Heath 92. I have performed all the windows 7 tuning tips, downloaded all up-to-date drivers including re-installing USB controllers. I have run DPC checker and LATMon and since disabled my wireless LAN and ACPI compliant control battery which removed all red and yellow latency spikes. If I set my USB buffer to 1, I get an almost perfect flat green line in DPC Checker. If i set it to 4 i get small green peaks that mirror the peaks in the resource manager so am pretty sure it is USB Port related. I also have no drivers running over 1.0 in LATMon since disabling LAN and ACPI battery but the USBPORT.sys is by far the largest in DPC. I have performed a selective start-up with msconfig but still get regular CPU spiking. When checking my resource monitor, system interrupts (DPC & ISR's) are causing brief spiking to 100%. As soon as I remove the USB Driver the spikes go away. Changing my latency setting does not appear to solve the issue either. I have reads that it may be something to do with ACPI.sys but this may not be able to be disabled with Win7? I don't know what else to try. I'm not particularly computer minded but am on a steep learning curve. Help anyone before i smash my laptop up in a fit of rage!