My PC has become corrupted and I suspect a virus because recently a JavaScript window opened, stating that Microsoft Antivirus 2013 detected a process and needs to perform a scan. Since there is no Microsoft Antivirus I didn't click the "OK" button. I know not to open attachments in emails from unknown sources. I won't open an email attachment even if it's from a friend if there is no subject or greeting. I rarely click on banners. Full system scans in Safe Mode with Malwarebytes and Superantispyware didn't find anything sinister and Kaspersky PURE won't scan in Safe Mode. Unless I can find another Hijackthis I'll have to beg the numerous software publishers for permission to redownload my programs. And I have over fifty games on Steam. Restoring my system after reinstalling Windows 8 Pro will take two full weekends. I'd appreciate a list of "DO NOT" steps for good PC hygiene. We all would benefit. Thank you very much.