Hello, I have re-installed Windows 2 months ago. It was a clean installation. I've also installed the required protection: - Avast Antivirus - Spybot Search & Destroy - Malwarebytes For about a week I have been having some serious problems: - My wireless mouse isn't always recognized/working. I hear the specific sound when I'm plugging its usb in the pc, but it just won't move - I've been installing small programs that usually take 30 seconds to install and it has taken 30 minutes to pass through the Wizard. Even opening Control Panel is a challenge. I have a total of ~20 programs, essential I may add. I'm certainly not overloading the pc. - The browser is working painfully slow. The Shocwave Flash plugin is constantly crashing and working in multiple tabs blocks any online activity whatsoever - When I was doing multiple things in parallel (browsing, installing a program, connecting my phone to the pc), Windows just crashed, there was a blue screen with a message that if it's the first time I see the screen I just have to restart it, but if it wasn't I should consult someone because I may have a software/hardware problem. I did restart it and things got just a little bit faster, except the browsing. I don't usually install things on my pc, but I have downloaded a couple of files from a torrent site (books mainly and a certain essential office package). Could it be a virus? If so, how? I'm protected. or is my pc just too old (4 years now since I bought it). Its ventilator sounds like a vacuum cleaner and I haven't been able to clean it properly since I don't have a matching screwdriver. Thank you in advance for your advices.