Logfiles Location/Rotation/Removal

[tactics]

The harddrive of our Plesk 4 win 7.0 server gets filled with logfiles in this directory:
C:\WINDOWS\system32\LogFiles
which contains a folder for each virtual server.

- Why are there logfiles here ?
- Shouldn't they be in the C:\Inetpub\vhosts\mydomain\statistics\logs folder only ?
- Can these logfiles be deleted savely ?
- Where can I setup auto logrotation / removal for these files ?

Thanks for you time
Gert.