The computer: Toshiba Satellite L645D-S4056, 4GB RAM, 500GB HD, AMD Turion II P540 Dual-Core 2.4 Ghz, with Win 7 Home premium x64.
The first problem, is that the computer got a virus i'm pretty sure because a friend installed a screensaver and it crashed after that, the system went into an infinite restart loop, i tried booting in safe mode and it always stopped at CLASSPNP.SYS then restart again, i tried to make a system recovery but it didn't work always stopped responding when tried that.
After many attempts i finally make a low level format to the hard drive, to start from 0.
After that the win 7 disk format the disk create the partition and install normally, but when everything was set up, the desktop runs very slow, i can only instal the display driver, the other drivers LAN, Wi Fi, TouchPad, Sound, etc. takes like 2 hours to install, and crashed windows after the touchpad installation.
I have reinstalled Win7 3 times and the 3 times everything runs the same, very slow.
Other things that have happen is that when checking the amount of RAM memory in the System it says 4.00 GB (1.74 Utilizable)
I tried to boot in safe mode to see if anything runs faster but no everything the same and i saw a long time when loading the CLASSPNP.SYS, after that it starts but goes slow even in safe mode.
I already perform a CHKDSK /F no problems at all
I already reseted the bios
I already defragmented the hard drive
The sata in the BIOS is set to AHCI
There isn't a BIOS update in the toshiba webpage.
There is no Chipset driver for this computer in the toshiba website.
Please help me solve this!!!!