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Windows goes from being quite fast to unworkably slow


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Hardware:

Quadricore, 8GB of RAM. Still 278GB of free space on my HD. Resources aren't a problem.

Software: Windows 7 (64)

Antivirus: Microsoft security essentials.

Yesterday, I get a warning that there are trojans in my windows/temp folder. I run my antivirus for a quick scan over the whole computer and a custom scan over my temp folder.

Today, I start the computer. At first, programs are about as fast as they usually are. After a few minutes, everythin seems to freeze for long periods.

I get warnings that Windows has stopped responding. Microsoft security essentials has scanned 4 items in the last 40 minutes. Openingg the "Computer" folder is taking several minutes. Opening a normal sized picture takes several minutes. I cannot ctrl+alt+delete because it cuts to a black screen and then tells me if can't get to that screen.

So, what could be going on?

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... tells me if can't get to that screen.

That is not a Windows message I have ever seen; what is the exact message?

After you start Windows (wait until the disk light stops flickering) close all unnecessary program in the systray; especially from the hidden icons group. Then try launching the Task Manager again. Do you see any unusual activity on the Processes tab?

Do you have any unexpected entries in the startup items? (Check with CCleaner or similar program.)

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