Recently I have bought a new RAM(512MB PC3200). When I insert both new RAM and old RAM(256MB DDR333) together, my computer will restart automatically when I executing programs. After the computer is restarted I will get a message from the Windows said: Critical Error!! Sometimes there is a message as I write below appeared before my computer restart: [Check to be sure you have adequate disk space. If a driver is identified in the stop message, disable the disable the driver or check with manufacturer for driver updates. Try change video adapters. Check with our hardware vendor for any BIOS updates. Disable BIOS memory options such as caching or shadowing. If you need to use safe mode to remove or disable components restart your computer, press F8 to select Advanced Option and then select Safe Mode] What did the message actually means? What should I do to fix this problem? What is happening to my computer? Please help me! Thanks!