Right, I'm not sure if this is the correct forum for me to talk about this problem but perhaps the thread can be moved if it is better suited elsewhere. My problem is that I have a Compaq Presario desktop and it has developed a problem that has me stumped. Basically after the computer has been switched on for a time, the computers audio and visual display start skipping at a rate of once per second or so. Its hard to explain, but what happens is if there is any audio playing it will still play but slightly jump every second or so. At the same time the desktop display will jump too, as if it freezes for a split second. For example, if I move the cursor from one side of the screen to the other during this time it will stop once or twice rather than moving accross smoothly. So far the only way I can stop this problem is restarting the computer, and even then it starts happening again eventually. I have updated and run lots of antivirus and anti-spyware scans (AVG, AdAware, Spybot) but to no avail. I even booted in safe mode to carry out a scan and the problem happened again even when the computer was running in safe mode. Then I thought it could be a driver problem so I tried rolling back certain drivers (Video, Audio, Ethernet) in case they had been updated and were causing problems. This did not solve it. So then I searched for the newest audio and video drivers for my computer and installed them. This did not solve the problem either. Since this started happening, I have been keeping an eye on what processes are running on the computer when the problem starts, but there are no processes out of the ordinary showing up in the proccesses tab when it occurs. So then I started thinking maybe it is a problem with my Ram, so I ran two runs with Memtest86+ and the tool showed up no errors with my 1GB of ram. For reference, shown below are some of the system details from the computer... And thats where I am now. I don't know what else to try and I am really stumped as to what is causing this annoying problem! If anybody can help and shed some light on any possible solutions or has any idea about what is causing this, I'd be very grateful.