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Windows defender not working.

Hi,

Ive been trying to download some apps and my pc now just crashes them and removes the files. I recently downloaded norton antivirus but got rid of it as i didnt want it. My windows antivirus has now gone and i dont know how to get it back. Any advice on getting it back? Thanks image.png.e81b3a91d821fa7eb06104d2c346c8b1.png

CPU: Ryzen 5 2600 @ 3.2Ghz 

Motherboard: MSI B450 Gaming Pro Carbon AC 

RAM: Team Vulcan DDR4 16GB (2x8GB)

GPU: Zoatac Gtx 1070 8GB 

Case: CoolerMaster Masterbox Lite 5 RGB

Storage: 2TB Toshiba HDD, 120GB WD Green SSD 

PSUGigabyte P650B 

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You likely ran some malware that wrecked Defender in order to protect itself.

F@H
Desktop: i7-5960X 4.4GHz, Noctua NH-D14, ASUS Rampage V, 32GB, RTX3080, 2TB NVMe SSD, 2x16TB HDD RAID0, Corsair HX1200, Thermaltake Overseer RX1, Samsung 4K curved 49" TV, 23" secondary

Mobile SFF rig: i9-9900K, Noctua NH-L9i, Asrock Z390 Phantom ITX-AC, 32GB, GTX1070, 2x1TB NVMe SSD RAID0, 2x5TB 2.5" HDD RAID0, Athena 500W Flex (Noctua fan), Custom 4.7l 3D printed case

 

Dell XPS 2 in 1 2019, 32GB, 1TB, 4K

 

GPD Win 2

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6 minutes ago, Kilrah said:

You likely ran some malware that wrecked Defender in order to protect itself.

I think i did lol 

 

CPU: Ryzen 5 2600 @ 3.2Ghz 

Motherboard: MSI B450 Gaming Pro Carbon AC 

RAM: Team Vulcan DDR4 16GB (2x8GB)

GPU: Zoatac Gtx 1070 8GB 

Case: CoolerMaster Masterbox Lite 5 RGB

Storage: 2TB Toshiba HDD, 120GB WD Green SSD 

PSUGigabyte P650B 

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Just now, PineyCreek said:

Try running a web-based scan like https://www.trendmicro.com/en_us/forHome/products/housecall.html

 

Or try to see if you can download MalwareBytes, etc. and run scans.

 

If nothing works...nuke it from orbit.  It's the only way to be sure.

whats nuking from orbit...

 

CPU: Ryzen 5 2600 @ 3.2Ghz 

Motherboard: MSI B450 Gaming Pro Carbon AC 

RAM: Team Vulcan DDR4 16GB (2x8GB)

GPU: Zoatac Gtx 1070 8GB 

Case: CoolerMaster Masterbox Lite 5 RGB

Storage: 2TB Toshiba HDD, 120GB WD Green SSD 

PSUGigabyte P650B 

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1 minute ago, Ben a cava said:

whats nuking from orbit...

 

Sorry...Aliens reference.  Basically, flat reinstall the OS.  Or try a repair.  If it's not malware, you could just tell Windows to try and repair itself.

 

Since it says the AV is managed by your organization, is this a corporate laptop?  That kind of message says that some form of security policy is in place to manage those settings...either placed by whomever manages your organization and Windows AD, or something set by a software bad actor to prevent you from touching it.

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25 minutes ago, Kilrah said:

You likely ran some malware that wrecked Defender in order to protect itself.

  

went into my register and changed some things to false and ive got this now but i cannot do a scan and my virus and threat proetion settings are all off and i cant turn them on

  

image.png

CPU: Ryzen 5 2600 @ 3.2Ghz 

Motherboard: MSI B450 Gaming Pro Carbon AC 

RAM: Team Vulcan DDR4 16GB (2x8GB)

GPU: Zoatac Gtx 1070 8GB 

Case: CoolerMaster Masterbox Lite 5 RGB

Storage: 2TB Toshiba HDD, 120GB WD Green SSD 

PSUGigabyte P650B 

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