I have a high CPU usage issue that I can't resolve. None of the processes show greater than 50% CPU usage but the total is almost always 100% even when just launching. Processes using high CPUs change regularly. It seems like a virus/bug but I can't locate it. Computer is slower than slow but can't resolve issue. It appears this happened when using wi-fi on unsecured line at hotel (unless it was coincidence) although I have anti-virus software installed. Any ideas please?