|"I already set the resolution at the minimum, 800 x 600 pixels, but it's still lagging"|
"my monitor's size is 17""
OK, I just wanted to make sure you weren't running 24" LCD monster with the resolution cranked up. The game should not be lagging at 800 x 600. When's the last time you scanned for viruses/malware/spyware, ran a cleaner such as CCleaner Slim or Glary Utilities, used MSCONFIG to disable unnecessary programs from loading at startup, defragged the hard drive, updated your drivers, etc?