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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.

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do you have a wallpaper or a solid color only? –  Snark Mar 18 '10 at 9:28
    
I have standard Windows 7 Wallpaper (bluish with Windows logo in the center, bird, butterfly, grass, tree etc.). I did change wallpaper only once about 2 weeks ago, but than returned back to default, since I didn't like any other. Does it have any influence on loading speed? –  Sergiy Byelozyorov Mar 18 '10 at 21:02
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2 Answers

up vote 2 down vote accepted

You could try running the System file checker and see if it helps. Windows key + R, type "sfc /scannow" without the quotes, reboot.

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Have performed the check. Windows Resource Protection did not find any integrity violations. –  Sergiy Byelozyorov Mar 18 '10 at 21:16
    
In event viewer, go to Microsoft->Windows->Diagnostics-Performance->Operational and look for events with the 101 eventid. This might get you a lead. –  CGA Mar 19 '10 at 11:30
    
While I wasn't able to determine the reason and just reinstalled the Windows, your advice may be useful for others, so marking this as an answer. –  Sergiy Byelozyorov Sep 2 '13 at 17:44
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You can try enabling the No GUI boot and OS information to see what file is taking too much to load - see this answer how to do it: http://superuser.com/questions/93727/how-can-i-find-out-which-driver-file-is-being-loaded-when-the-system-hangs-during/120643#120643

You can also check the Startup and Services tabs since you are in the System Configuration to disable what you don't really need.

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Tried it. It loads all libraries almost instantly, but there is big delay after last library loaded and before login screen appears –  Sergiy Byelozyorov Mar 18 '10 at 21:43
    
Second paragraph of your answer won't help, since I have delay in Windows loading speed, not user account loading speed –  Sergiy Byelozyorov Mar 18 '10 at 21:43
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