hi a;m a newbi here can someone help In general learned from growing hooves. windows performance toolkit, windows 7. Recently staged package windows performance toolkit, to examine why so slow to boot windows 7, bootPrep_BASE+CSWITCH_2_km_premerge.etl . And now every time you boot up the computer file is created bootPrep_BASE + CSWITCH_2_km_premerge.etl in the folder on my desktop. Delete the folder but at the next reboot, it still created and begins to write the file, which can grow to very large sizes. How can completely remove this package? Plz help it's doing my head in.