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Windows 7: Computer goes very slow even after reformatting

18 Mar 2012   #1

Windows 7 Home Premium 64bit
Computer goes very slow even after reformatting


I will try to make this story as short as possible, but I am very frustrated on this.

My dad's laptop had gotten a bunch of viruses/rootkits, so I decided to use KillDisk and erase everything with one pass.

Everything gets done and I reinstall Win 7 Home Premium 64bit. Install everything and use the laptop like normal.

For the first five minutes, everything is fine. Loads programs up in a couple of settings.

After the five minutes, it starts getting very slow. The mouse is lagging. Everything takes a couple of minutes to load. The only thing I even did besides have it on was install Windows Update when you first reformat.

After a few more KillDisks and reformatting. the same problem is happening. I know rootkits are harder to kill than most, but can it be possible it is STILL alive?

I also am thinking maybe something inside the laptop is wrong (CPU, HDD.) How would I be able to check this to let you guys know?

I will try the HP Recovery Manager in a while and see if there is any difference.

Please, if anyone could help me and give me at least some ideas to why this is happening.

Thank you.

My System SpecsSystem Spec

18 Mar 2012   #2
Microsoft MVP


It's unlikely the virus could survive a simple format or just the Diskpart Clean Command
which wipes the boot sector, although some can get into the BIOS.

First I would concentrate on getting a perfect reinstall: Clean Reinstall - Factory OEM Windows 7 - Windows 7 Forums

Then if necessary compare that with Factory Recover if you made the DIsks or saved the Recovery partition: HP Recover Windows 7 Operating System Using HP Recovery - HP Customer Care (United States - English)

If problems persist test your hardware and work through these other troubleshooting steps
My System SpecsSystem Spec
21 Mar 2012   #3

Windows 7 Home Premium 64bit

Dust in the fans and heat sink could cause this. (heat may cause CPU to 'throttle') You can try a can-of-air, if that helps you know you need to get it cleaned.

A Laptop, depending on when and where you uses it, can require cleaning annually.
My System SpecsSystem Spec

21 Mar 2012   #4

Windows 7 Pro with SP1 32bit

Please delete all the partitions of the Hard Disk before doing the next clean install of Windows 7. This shall make sure that every trace of the viruses and root-kits is gone.
My System SpecsSystem Spec
21 Mar 2012   #5

windows 7 x64 pro sp1

get more ram as well. running 2 gigs with windows 64 will slow it down
My System SpecsSystem Spec
21 Mar 2012   #6

Windows 7 home premium x64

I'm with Gregrocker, there have been quite a few rapidly spread rootkits lately, many of which also infect the BIOS, try running a dedicated rootkit killer. Your AV should have one , I have used |MG| Kaspersky TDSSKiller Download

with reasonable success.
My System SpecsSystem Spec

 Computer goes very slow even after reformatting

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