Hi All, I've been having intermittent problems with my computer freezing up. I bought and installed 2 x 1gb PC3200 ram modules. And I bought a Logitech wireless keyboard and mouse combo. Installed the combo and it all went sweet, no problems. Took the computer apart. I had 2 x 256mb ram sticks in pos#1 and #3. I added my 2 new sticks in pos#3 and #4. Plugged the usb wireless receiver back in and booted up. Seemed alright, put software CD in computer and it locked up. I restarted and it froze in about 5 seconds. I reverted back to my standard keyboard and mouse and got back to the software installation which required the receiver plugged in which froze the computer again. I restarted and removed the receiver but after a few minutes I got that blue screen memory_management error. So in the next reboot I removed the CD and it's been going good for at least 10 minutes. Can someone give me some suggestions? Could the CD have caused the issues? Also is there a specific way of installing ram? I noticed the 2 new ram modules were a little difficult to push down so the white clips locked. But all 4 definitely locked and both the system specs screen and the ram optimizer accurately register that I now have 2.5g ram. Thanks for any suggestions.