As for the speed problem:
Turn on VSynch =) To do this, go to your desktop,, right-click, hit "properties". Go to "settings". Hit "Advanced". Look around for your video cards software tab and under "performance settings" look for "Vsynch" or "Wait for vertical synch" and turn that ON. Then click the "monitor" tab and set teh refresh rate to 60htz if at all possible
Note that, in normal Windows, 60htz will hurt your eyes after a while, so make sure to revert it back to 75 or 80 or whatever the default is.
As fort he crash, hmm, you do hae a full, LEGAL copy, dont you? Pirated versions tend to have crashes liket hsi, and there isn't anything we can do to help.