Perflib_Perfdata in Local Temp folder- What is it ?

Due to some reasons I need to clear out my Temporary folder daily on Windows XP desktop. Since past 3 days, though I keep cleaning the folder I always see the following 2 files remaining over there which ' Perdata_2d4.dat and perdata_388.dat. I don’t have any information about these files. Can anyone of you please tell me what are these files related to and why I’m not able to delete them permanently?

Please help.

You should try going to start/../admin tools/Performance. Here you will find the setting for making log files. Hope you get some help from here.