Computer Won't Sleep

So I reinstalled Windows again on my machine about 3 days ago, and in the process of reinstalling my old programs and settings, my computer has stopped sleeping automatically. Before I had installed very many programs, my computer was set to sleep after 1 hour and did that every time. Now, the setting is still the same, but I'm assuming some device or program is preventing it from sleeping. The monitor turns off at the right time, and the sleep button on my keyboard puts the computer to sleep, but it won't do so automatically. Is there any utility or method that can help me troubleshoot what is preventing my computer from sleeping? Thanks!

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Update your Display driver. This is almost always the culprit. You may even need to try the next oldest driver, or a Vista driver.

Check optional Windows Updates for newer drivers, then the Support Downloads webpage for your computer or Display adpater model.

gregrocker said:

Update your Display driver. This is almost always the culprit. You may even need to try the next oldest driver, or a Vista driver.

Check optional Windows Updates for newer drivers, then the Support Downloads webpage for your computer or Display adpater model.

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User CP>Edit Signature

In addition to your display driver (as suggested by gregrocker), check your mouse, USB hubs and NIC settings. Using control panel make sure that the "allowed to awake" options are checked/unchecked.

Thanks for the replies! I'll give those a try.