1. Run a scanning program: Most anti–virus programs come with their own scanning tool which looks out for any malicious software on your computer. Run a full scan of all your files and folders and make sure to check for anything suspicious.

2. Look for strange behavior: If your computer is acting strangely or some applications are not working as usual, it might be a sign of a virus. Outdated software can also be an easy target for viruses, so make sure to always keep your programs up–to–date.

3. Check for unusual processes and files: Sometimes viruses can hide in the form of unknown processes or strange files. To view any unknown processes, open the Windows Task Manager (CTRL+ALT+DEL) and take a look at the list of running services. You should also take a look in your files and folders and search for any files that you’re unfamiliar with.

4. Malicious emails: Malicious links and attachments can be sent via emails. If you have opened any suspicious emails, then it‘s possible that you have been infected.

5. Get help: If you’re unable to detect any viruses on your own, it’s best to contact a professional who can help you find the source of the infection and remove it completely.

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In Vim, you can use the “u” key to undo the last changes you made. You can also use the command “:undo” to undo all the changes you made in the current session. To undo multiple changes, press the “U” key multiple times or use the command “:earlier n” where n is the number of changes you want to undo.