Hello, Computer worked fine with Win8.1 until my antivirus self-disabled and a very high CPU/Mem/Disk usage episode occured last night. Following that, it became impossible to run Firefox and Chrome, they keep crashing. IE works for very brief periods, then crashes too. Tried MBAM twice but it refuses to complete and hangs up at some time. DDS will not run and gives out a 'compatibility mode' issue. Tried uninstalling / reinstalling firefox to no avail. After further tests, every kind of app seem to crash on startup or after a little while, including notepad... However windows boots fine. The kind of crash is weird. ctrl alt delete seems to hang up too. I have to reboot or must be very patient. I suspect malware because computer is recent and worked A1 til last night and everything was so sudden. Sorry I cannot post the requested logs. Thanks for your time.