Let's try some basic troubleshooting.  If the problem still persists
please post back and we'll try some more steps. Good luck! :-)

1. To see if it's a software conflict:  Temporarily disable Startup
programs one at a time, starting with Firewall, Antivirus, and ad
blockers using: http://new.jtsoft2001.com/windows/startup.php

You can lookup what a program does before you disable it here:
http://www.sysinfo.org/startuplist.php

2.   Run a virus scan at: http://housecall.antivirus.com Afterwards
Download & Run Spybot from: http://security.kolla.de to find any
Trojans, Adware, or Spyware which could clog up your system.

3.  Click My Computer / Rightclick the Drive & Choose Properties
/ Run the "Disk Cleanup..." / Next Click the "Tools" Tab and run
the "Error-Checking" and "Defragmentation" utilities.

4.  Go to the Windows Update site for everything under Critical and
Recommended: http://windowsupdate.microsoft.com  Some games
require a patch: http://www.avault.com/pcrl/patches_list.asp?letter=a

5.  Update DirectX and your Chipset, Sound, &Video Drivers:
For all Video / DirectX / Game and Hardware Issues, I have a
Checklist of Solutions at: http://mvps.org/nibblesnbits/Video.html