I was recently the victim of credit card theft stemming from online bill pay, so presumably my computer is infected. A week ago, I installed Avast's free virus protection software. Previously, I was only using Windows Defender which was updated regularly and never found anything malicious. I set Avast up to take over security operations, did a scan and found nothing. However, over the past few days, strange things have been happening to my computer that lead me to believe it is still infected somehow.
Issues I'm having:
Every time I restart my computer, it turns off and on just fine, but I am met by the same notifications every single time it boots up. These include a prompted review of my privacy settings before I can update to the Windows 10 Creator update coming soon, some patch updates for Blizzard video games I play, an update for Razer Synapse, all of which I have completed dozens of times over by now. Additionally, every time I open Firefox, I open to a page asking if I would like to restore to a previous session from a few days ago.
I have also tried altering my startup processes to disable Blizzard Launcher, iCloud, Plex, Razer Synapse, etc. and every time my computer restarts, they are turned back on. It seems like my computer just keeps rolling back to a previous point in time.
I am also unable to reboot into Safe Mode. I've tried F8 at restart. I've tried shift+Restart. My computer just always bypasses and goes through the regular boot sequence with the ASUS screen followed by my admin user login screen.
And as of about 30 minutes prior to this post, I am now getting MEMORY_MANAGEMENT BSOD's. I can't run chkdsk or memory diagnostics because of the same restart issues.
Things I've tried:
I followed a friend's link to a one-stop-shop computer cleaning solution via Lawrence Technology Systems. This included a Junkware Removal Tool, cCleaner, TDSKiller, ADW Cleaner, and Malware Bytes. I completed all but one of these and found nothing. The one that could not complete was the TDSKiller. It actually does literally nothing when it is executed. I tried changing the name of the file, per suggestions online. Still nothing. So I found another rootkit scanner called Malware Bytes Anti-Rootkit Beta, but it could not perform a scan because of a DDA Driver not being installed due to error. It prompts a restart and installation of the driver to allow for a scan. I click okay, but again, my computer restarts and goes directly back to square one as if I did nothing.
I also tried an Avast boot-time scan, and it gets bypassed by the same restart procedure. Avast Full System Scans also stop at 0% and says the scan failed and the system needs to be restarted. I cannot uninstall Avast because it requires a Safe Mode extraction with Avastclear.
Where do I begin to try to fix this issue? Your help would be much appreciated! Thanks