Prefetching Registry

Go into registry and edit the prefet section to only fetch the OS files. Or even do no prefetch if you want. I use a setting of 2 which prefetchs only the OS files.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters
key name EnablePrefetcher
0?Disable
1?Application Launch Prefetch
2?Boot Prefetch
3?Prefetch everything