The computer takes longer to boot to the Windows desktop.
Applications do not load or frequently stop responding.
Frequent system error messages occur.
Unfamiliar icons are added to the desktop.
The system performs slowly, especially while browsing the Internet.
Browser windows close unexpectedly or stop responding.
The browser home page changes and cannot be reset.
Pop-up windows display more frequently and/or when the browser is not open.
Unfamiliar toolbars are added to the browser.
The default web search engine changes.
Clicking a web link does nothing or leads to an unrelated website.
Webpages are automatically added to your favorites list.
Email messages or social media posts are sent from your account without your knowledge.
Unexpected and near constant hard disk access occurs.
Here is how you would act to get your laptop back to track.
Step 1: Turn on a firewall
Step 2: Obtain Windows Security updates
Step 3: Check your virus scanner software for correct configuration
Step 4: Install antivirus software
Step 5: Update antivirus software definitions
Step 6: Scan for viruses and malware
Step 7: Remove virus or malware by recovering the computer
You could find detailed information here: https://support.hp.com/us-en/product/hp-envy-17-n100-notebook-pc/8499288/model/8903915/document/c03327592