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Computer goes very slow even after reformatting
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.