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I recently got a nasty piece of malware of some sort that forced me to do a complete re-install. It was actually probably I good thing - my old windows was filled with random junk that should have been cleared out anyways. Long story short, I started from scratch with a fresh re-install and format of all my hard drives.

Strangely enough, I very quickly noticed that the computer was running very slowly. I had never had any speed issues before, even with multiple copies of games running simultaneously, so I was very surprised.

I opened up task manager to check my stats - turns out I was hovering around 12-28% CPU usage and ~3GB RAM (out of the 8 gigs on my machine). Despite this, the computer has been running incredibly slowly since. I've tried all the easy stuff (restarting, defrag...).

Any ideas on what could be going on?

Stats: Alienware Aurora (don't hate :c) Intel i7 - 930 @ 2.80GHz (8CPUs) ~2.8GHz 9216MB RAM Windows 7 Home Premium 64bit

EDIT: I ran a disk check on all my drives - no cigar, windows says everything is fine.

Details: If I had to describe the issue, I'd say it's on again - off again lag. During the 5-30 minute periods where the computer is runing slow, I can barely do anything. Often even the most basic things will freeze up, IE, the task manage will stop responding, and when I open the start menu, typing a letter into the search causes the whole bar to freeze up. Often I am unable to even get a response from ctrl-alt-del. Sometimes it's not quite that crippling, but even still it's bad - I noticed I once opened a folder and it took a very long time to open (sounds like hd issues...). Again, the strange part is that I can use the computer for up to 50 mins without issues, then I have to wait 20 mins or so before it's usable again.

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Saying it's running "slow" doesn't give us a clear picture. It's like asking "Is this chick hot?" but not posting pictures. Might as well use an 8 ball for answer. . . –  surfasb Oct 15 '11 at 19:14
    
Just updated OP :) –  guywhoneedsahand Oct 15 '11 at 19:46
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How exactly did you re-install Windows? Did you use an original DVD, or did you use an existing recovery partition, or some ISO file? Reason I'm asking is because your malware might have been hiding in one of the latter 2 and just reinstalled itself. Or it may have been a rootkit that still roams around. Same if you kept un-checked/un-clean files from your older installation.

Also, you cannot rule out hardware issues - you may have a bad (or overburdened) HD, for example.

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I re-installed windows from a legitimate windows DVD that came with the computer. When I did the re-install, I formatted my HDs and deleted the all the partitions during setup, so all data SHOULD have been erased, right? –  guywhoneedsahand Oct 15 '11 at 18:20
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Do you know ProcessExplorer? Try to use it and detect memory and CPU hog - their usage are higher than I can imagine for ordinary Win7 –  Lazy Badger Oct 15 '11 at 18:30
    
Really strange - all of a sudden the computer is running much faster. Should I be worried because it might be some sort of virus, or happy that the speed issue was a one-off thing? –  guywhoneedsahand Oct 15 '11 at 18:37
    
I agree that you haven't ruled out a bad hard drive. Have you run a thorough CHKDSK /f /r on it? –  Canadian Luke Oct 15 '11 at 18:52
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Clean install of Windows 7 always has a hour or so of housekeeping to do when you first log into your user account, I normally log into a clean install and let it sit for an hour before I start other user tasks. Indexing seems to be the biggest task after a clean install, sometimes it will also do a scheduled defrag of the disk. Normally this housekeeping does not bog a system down, but have seen some that do for unknown reasons. –  Moab Oct 17 '11 at 3:02
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