Very slow windows startup

[kekk0]

Hi,

my pc suddenly takes a lot of time to start windows, and the disk is busy for many minutes at startup. I don't have spywares/rootkits/viruses of any kind. I monitored the disk access at startup with filemon and I noticed that services.exe reads all the files on disk c:. The only service that starts with services.exe is plug and play. I've found around that someone managed to solve this by making file system permission changes in group policy, but I never modified it...

Any ideas?

Thanks in advance!!!