Dell Dimension XPS 410 with Seagate hard drive problem

[Lasher]

8. OK, I've downloaded Speedfan 4.43.

The download process made me paranoid. The download manager wanted to include all kinds of crap, plus change my browser home page and default search engine. Six other programs installed besides Speedfan. One application called FlipToast is particularly annoying.

Running Speedfan, here is what the top field in the Readings tab says:

Win9x:NO 64Bit:NO GiveIO:YES SpeedFan:YES
I/O properly initialized
Linked ISA BUS at $0290
Linked Intel 82801HB ICH8 SMBUS at $ECE0
Found nVidia GeForce 8800 GTX
Linked nVidiaI2C0 SMBUS at $3D403E3F
Linked nVidiaI2C1 SMBUS at $3D403637
Linked nVidiaI2C2 SMBUS at $3D405051
Scanning ISA BUS at $0290...
SuperIO Chip=SCH5514
Scanning Intel SMBus at $ECE0...
Scanning I2CNVidia SMBus at $3D403E3F...
ADT7473 (ID=$73) found on SMBus at $2E
Scanning I2CNVidia SMBus at $3D403637...
Scanning I2CNVidia SMBus at $3D405051...
Found Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz
End of detection

Under the S.M.A.R.T tab there is nothing in the Hard disk field and no information displayed anywhere else there.

Just ran Malwarebytes, 8 occurrences of malicious software discovered. These include 7zip_setup.exe, SpeedFan.exe, and several occurrences of the Trojan I Want This.crx

Executing System Restore to un-do whatever this download has done.