I messed up and installed a virus

Installed a program (It was a trainer for game) and it instead was a virus/malware/adware.

I uninstalled and ran malware + windows defender. Then I ran revo uninstaller found more of it and delete that. Ran CCleaner then Malware + Win Defender in offline.

After all this, Chrome randomly opens tabs to sites with a lot of adverts (I have uBlock so all I see is the warning page, but sometimes one will make it through ) every couple minutes.

What else can I do before considering reinstalling the OS?

By 'ran malware', did you mean Malwarebytes ? https://www.malwarebytes.com/
If not, download free version and run. Another good one is Superantispyware.-
http://www.superantispyware.com/

Run 5 or more AV software programs.
If there is still malware appearing after using 5 different AV software programs there are cases in which additional software can be used.
Quarantine then delete all malware and PUPs.
The most comfort comes from making a clean install.
You may be able to find a restore point if the malware does not block using Windows PE.

ESET: Free Virus Scan | Online Virus Scan from ESET ESET
MALWAREBYTES: Free Cyber Security & Anti-Malware Software | Malwarebytes
KASPERSKY Tdss killer: https://usa.kaspersky.com/downloads/tdsskiller
SUERANTISPYWARE: SUPERAntiSpyware | Remove Malware | Remove Spyware - AntiMalware, AntiSpyware, AntiAdware!
AdwCleaner: AdwCleaner | Malwarebytes
zemana: Zemana - AntiMalware and AntiLogger Protection
Norton Power Eraser: Norton Rescue Tools
Free Antivirus Software - Download Bitdefender Antivirus Free
https://usa.kaspersky.com/free-virus-scan
Free Anti-Malware & Malware Removal | Malwarebytes
Download Malicious Software Removal Tool from Official Microsoft Download Center
Download Free Antivirus Protection | Avast 2018
SUPERAntiSpyware - AntiAdware. AntiSpyware. AntiMalware.
How to remove malware from your Windows PC | PCWorld

Ill get to it thanks.

zbook said:

Quarantine then delete all malware and PUPs.

On the subject of PUPs though, I've had some of them that just wont go away. Ill run malwarebytes with chrome open, it will 'remove' them and close chrome. But when I open chrome again they're back!

Image of PUPs

For all of the AV scans post images of the results into the thread.

Also in the left lower corner click on the Microsoft Windows icon then power.
At the same time hold down the shift key and click restart.

In the Windows advanced troubleshooting menu click on system restore and report into the thread whether you do or do not have a restore points that predate the installation of the malware.

I have a couple from the 3/22

I made the install on saturday

Sometimes malware can interfere with Windows recovery.
Other times valid system restore points may not work.
That may be the most effective and efficient way to fix the malware.
If there was malware on the computer that was not detected before the 3/22 date then you would still need to run all of the malware scans.

https://www.malwarebytes.com/adwcleaner/


From zbook's post above, recommend you first run AdwCleaner and then the recommended scans. I would also remove Chrome entirely and reinstall.

The 5 that I prefer to use are:
1) Malwarebytes
2) ESET
3) Superantispyware
4) Kaspersky
5) AdwCleaner

"Also in the left lower corner click on the Microsoft Windows icon then power.
At the same time hold down the shift key and click restart. In the Windows advanced troubleshooting menu..."

This advice is good but you don't know when the stubborn registry and startup tasks items were installed so it's rare that System Restore helps.
I would take the step of first putting all the scan tools on a flash drive. Unplug your internet cable or turn off wireless so there's no chance a virus can 'phone home'.

Follow zbook's direction to restart into Advanced Startup Options, select: Troubleshoot\Advanced options\Startup settings\F5=Safe mode (you need to use an admin PASSWORD, NOT PIN to use/exit Safe Mode). Plug in the flash drive and run your scans and removals in Safe Mode where the adware/malware/PUPs don't load at startup. When done applying tools, reconnect internet, restart and hopefully you're good to go. Good Luck