I have installed Windows 7 64-bit about two week ago. Since then everything was working alright, but yesterday Windows started to load much slower. Main delay comes while Windows logo is glowing -- it used to be around 10-15 seconds and now it's around 2 minutes.
As far as I remember, I have only installed Microsoft IntelliMouse driver recently and removed it today. Unfortunately I found out that I have switched off System Restore some time long ago, so can't even test if the problem can be fixed by restoring old version.
How can I troubleshoot the problem? Can I somehow find out what's causing the delay?
P.S. Please don't suggest to reinstall Windows. I know that will help, but reinstalling all software and settings is a pain and requires a lot of time.
Edit: I have also noticed that Windows Explorer is behaving strangely. It stopped showing icons for some files and folders and constantly hangs up (so that I have to restart it using Windows Task Manager).
Edit: Seems like the problem was that Windows went nuts completely -- slow loading was just the introduction. Later
explorer started to hang up constantly, Skype conversation quality went totally bad. I couldn't even copy a file, since explorer was not working. I've reinstalled windows afterall.