The platform is WinXP. The problem is that I need to record the values along runtime (say, 48 hours). I am familiar with perfmon but as far as I know this tool cannot record the performace of different processes but it only gives the information for the whole processes running at the same time.
Use log file size option in setting to limit the size of log file which can be handled by Excel. This will create multiple files. for already created files you can use free file Bifurcate applications.