I have windows 7 originally but upgraded to 8.1. Lately just running firefox and vlc media player messes up windows. And I don't know why. Ok here's what I did > I went to control panel and went into the System settings and it shows. Windows 8.1 Pro System Processor: AMD E-300 apu with Radeon(tm) HD Graphics 1.30 GHz Installed Memory (RAM): 2.00 GB (1.49 GB Usable) System Type: 64-bit Operating System I do run the free version of AVG virus scanner from time to time last time in fact was last week it found nothing. I don't have a program currently installed to check for errors but I did download Advanced Systemcare 8 but have not installed it yet. Hard drive on Desktop sticker says its a 500 GB but (C says its 446GB and I have 217 GB free. Is there any way to check my pc for errors with what comes with the windows 8.1 or is there a free good program to use I need all the help I can get. I'm new to tinkering with pcs.