Run the boot version of Memtest86+ paying close attention to Parts 2 and 3 of the tutorial. Also, in case Memtest86+ misses anything and comes up with no errors, run the extended version of the Windows Memory Diagnostics Tool for at least five passes. These you may want to run overnight since they take a long time to complete (run them an hour before bed each of the next two nights and check before going to sleep that they are still running).
For Part 3: If You Have Errors: If you swap any memory components, follow these steps for ESD safety:
Shut down and turn off your computer.
Unplug all power supplies to the computer (AC Power then battery for laptops, AC power for desktops)
Hold down the power button for 30 seconds to close the circuit and ensure all power drains from components.
Make sure you are grounded by using proper grounding techniques, i.e. work on an anti-static workbench, anti-static desk, or an anti-static pad. Hold something metallic while touching it to the anti-static surface, or use an anti-static wristband to attach to the anti-static material while working.
Once these steps have been followed, it is safe to remove and replace components within your computer.
System Manufacturer/Model Number HP Pavilion e9110t OS Windows 7 Home Premium 64 Bit CPU Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz Motherboard Pegatron IPIEL-LA3 Memory 6.00 GB Hundai HMT125U6BFR8C-H9 Graphics Card ATI Radeon HD 4850 Sound Card Realtek High Definition Audio/ATI High Definition Audio Monitor(s) Displays Acer AL2216W Screen Resolution 1680x1050
Keyboard HP Keyboard Mouse HP Mouse PSU Unknown/installed by HP Case HP generic case Cooling Intel Stock Cooling Hard Drives Hitachi HDP725050GLA360 ATA Device 500 GB Internet Speed Download: 19.15 Mbps Upload: 1.67 Mbps Other Info Network Adapter Realtek RTL8168D/8111D Family PCI-E Gigabit Ethernet NIC (NDIS 6.20)
Network Adapter 802.11n Wireless PCI Express Card LAN Adapter