Lock ups and dumping psyical memory!!!

Hi i have just installed a new pc most of the stuff im useing is from my old computer so i know they work fine im running a:
P4 3GHZ Prescot 800MHz, HT-Enabled
865PE Neo2-P
512 DDR-400 Twin moss
ATI Radeon 9000 pro
PSU-400
XP Pro
My computer locks up alot when running intense games (games have worked before no problem) i also get a error saying dumping pysical memory, i have looked about and tried to solve this myself, i found that someone was haveing the exact same problem as me and he fixed it by turning the FSB down as his memory wasnt compatable with his motherboard if doing that works how do i do it ?
Many thanks Jonathan

Flappa, Your memory " clock" is fine and there is no need to "underclock it" as long as you did not mess with the Bios.
I had the same problems. I could not even get thru a Clean install of windows as it would Blue Screen
1- are you running in " Dual Channel Mode"?
2- If so is your memory a " match Set"?
some times memory even thought it has the same markings is not matched . Dual channel sets are matched and made to run together in "Dual Channel Mode"{
( Even though I had the same manufacturer memory my set would not run in Dual Channel without " Blue Screening" I bought a Matched Set of Kingston Valueram and have not had a problem since
3- If it is not a matched set, pull one stick out and run it for a while , if it still bluescreens try the other stick
4- raise your memory voltage to 2.7 or 2.8 ( which ever is the lowest that it runs stable)
5- If all this does not work , run MEMTEST to see if there is a problem with both sticks
6- you are running a Bios Version that supports the " Prescott Microcode" right?
Let us know what your findings are
Good Luck  
Dave

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    com.apple.iokit.IOSMBusFamily          1.1
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    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          345
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    com.apple.driver.AppleKeyStore          28.21
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    com.apple.iokit.IOPCIFamily          2.7.3
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    1. This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
    OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
    2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user, but internally Apple calls it "XProtect." The malware recognition database is automatically checked for updates once a day; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
    The following caveats apply to XProtect:
    It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
    It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
    3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
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