Hi everyone, I need some advice diagnosing a problem with my parents computer. I have been trying to help them out over the phone, so please bear with me on this. The computer is a few years old. Runs Windows XP with 512 MB RAM, 1.8 GHz processor and a 120 GB hard drive. It's "protected" from Viruses and Spyware by Norton Internet Security 2008. On Sunday my parents called me saying that the computer had slowed down immensely. I clocked over 20 seconds just for them to expand the start menu. Running programs is nearly impossible. I was able to walk them through a round of Advanced Windows Care and Ccleaner to fix any registry glitches and clean out any junk files. That did not help the problem at all. They also did a MalwareBytes scan which turned up nothing. Then they attempted to defrag the hard drive over night, but it was impossible due to the extreme lag. The really odd part is that CPU usage hovers between 5-10% even while lagging terribly, with occasional spikes up to 15%. I expected it to be maxed out... Any ideas on how to fix this problem are extremely appreciated! It has been very difficult to help them through this, because it takes such a long time to run the diagnostics that I am so familiar with.