Computer goes very slow even after reformatting

[Ahzrukhal007]

Hello.

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.

 

[gregrocker]

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

 

[opraus]

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.

 

[wanchoo]

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.

 

[w1dpc]

get more ram as well. running 2 gigs with windows 64 will slow it down

 

[cyclic]

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 2.7.20.0 Download

with reasonable success.