My older Macbok pro with a new 2Tb seagate barracuda internal hdd is running very slow. Spinning ball, dropped or hanging apps. Suggestions

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My older Macbok pro with a new 2Tb seagate barracuda internal hdd is running very slow. Spinning ball, dropped or hanging apps. Suggestions

My older Macbok pro with a new (this week) 2Tb seagate barracuda internal hdd is running very slow. Spinning ball, dropped or hanging apps. ( and yes, I know that a ssd is way faster!)

Any Suggestions?

Background- it may have nothing to do with the hdd, because 1 month ago I went abroad and used the wifi in the airports/ hotel. Upon returning, the system was so slow. My Mac guy suggested from first aid, etc. that I transfer some off, backup then wipe the drive and start over. This did not help-still slow. In desperation I even used an external drive as an internal while getting another drive. That was crazy slow as well. Now the barracuda. Have to think something bad is hanging around...in software, virus etc.

Please see the etracheck

(in full disclosure. I don't know what I don't know regarding repairs. Any guidance is much appreciated.)

EtreCheck version: 4.1 (4A162)

Report generated: 2018-03-04 11:43:41

Download EtreCheck from https://etrecheck.com

Runtime: 9:36

Performance: Below Average

Problem: Computer is too slow

Major Issues:

Anything that appears on this list needs immediate attention.

Adware - Adware detected.

Minor Issues:

These issues do not need immediate attention but they may indicate future problems.

Heavy RAM usage - This machine is using a large amount of RAM.

Unsigned files - There is unsigned software installed. It appears to be legitimate but should be reviewed.

Low performance - EtreCheck report took over 5 minutes to run. This is unusual.

Corrupt hosts file - Hosts file is corrupt.

32-bit Apps - This machine has 32-bits apps that may have problems in the future.

Hardware Information:

MacBook Pro (15-inch, Late 2011)

MacBook Pro Model: MacBookPro8,2

1 2.2 GHz Intel Core i7 (i7-2675QM) CPU: 4-core

16 RAM Upgradeable

BANK 0/DIMM0

8 GB DDR3 1600 ok

BANK 1/DIMM0

8 GB DDR3 1600 ok

Battery: Health = Normal - Cycle count = 4

Video Information:

Intel HD Graphics 3000 - VRAM: 512 MB

Color LCD 1440 x 900

AMD Radeon HD 6750M - VRAM: 512 MB

Drives:

disk0 - ST2000LM015-2E8174 2.00 TB (Mechanical)

Internal SATA 6 Gigabit Serial ATA

disk0s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk0s2 - U******d (Journaled HFS+) 2.00 TB

Mounted Volumes:

disk0s2 - U******d 2.00 TB (718.89 GB free)

Journaled HFS+

Mount point: /

Network:

Interface en0: Ethernet

Interface en4: iPhone

Interface fw0: FireWire

Interface en1: Wi-Fi

802.11 a/b/g/n

One IPv4 address

Interface en3: Bluetooth PAN

Interface bridge0: Thunderbolt Bridge

System Software:

macOS Sierra 10.12.6 (16G1212)

Time since boot: Less than an hour

System Load: 2.65 (1 min ago) 2.53 (5 min ago) 1.62 (15 min ago)

Configuration Files:

/etc/hosts - Count: 17 - Corrupt!

Security:

System Status

Gatekeeper Mac App Store and identified developers

System Integrity Protection Enabled

Adware:

Launchd: ~/Library/LaunchAgents/com.spigot.ApplicationManager.plist

Executable: ~/Library/Application Support/Spigot/ApplicationManager --protect

Reason: Adware name match

Unsigned Files:

Launchd: /Library/LaunchAgents/com.divx.dms.agent.plist

Executable: /Library/Application Support/DivX/DivXMediaServer.app/Contents/MacOS/DivXMediaServer