Keyloggers/Virus?

Yes, the PC has the password access to the router and can perform a DNS change, directing your Mac to a fake site to install software with your help.

Take the PC offline, reset your router and update it's firmware using the Mac,

Don't let the PC have the admin password to the router EVER, not your Mac either in a permanent fashion (as a keychain)

Give all devices ONLY guest access to the router, this way they can't make changes through malware or malicious person.

Setting up a wifi router

there is really only one secure way left to make sure your not hacked. WEP and WPA are both cracked. A too small of a password is easily brute forced by new graphics based cracking software and worldwide botnets.

1: Update your router firmware. For Airport it's easy, just use Software Update and/or update in Airport Utility.

2: WPA2 (AES) Personal easier (or Enterprise)

3: 2 - Random 20+ letter, number, character, symbol, case passwords. One for the Admin use of the router only, kept off the machine and locked in a safe, the other for Internet Access only used on all devices. A password this strong will take until the next Big Bang to crack, perhaps a quarter of that as technology improves. Certainly not in your lifetime.

4: MAC address filtering and invisible networks are no match for hackers. Don't bother.

5: Rotate the Internet Access password to keep people you don't want back on, from coming back. Once they have the password it's logged permanently into their machines. They could delete it, but most don't know they can or won't.

Use the Mac to clean up and reset the router properly, then allow both only Guest access to the router for Internet access only.

Clean up the PC or take it to someone who can or just recover files and trash it.

Always on anti-virus often bricks the Mac when Apple issues a Software Update.

Apple has Xprotect watching for trojan downloads.

If you need to clean Windows viruses, use the free ClamXav, it's all you really need at this time.

28 years on a Mac, only one virus pre-Internet, WDEF came on a game disk. 🙂

Malware for Mac's is exceedingly rare occurance.

AppleDavid wrote:

what if I cleared my computer [pc] to factory settings? will i be safe?

If leave the PC turned off, fix the router, then update the Mac, then your network is secure and you can then reset the PC back to factory, however it's insecure in that state, so you have to clear off all the PC vendor crapware/bundled anti-malware etc that's insecure (don't allow nothing to automatically connect online from the PC in factory state) then use the secure network to Windows update it and then install Microsoft Security Essentials etc.

Returning a Windows machine back to factory state and keeping it safe online until it's updated (and passed validation) isn't a easy task, use the Mac to get info on what to delete on the PC before allowing it to connect to the Internet as it will get pwned in seconds if it does, then your back to factory again. 🙂

Usually back to "factory+remove crapware+ update + install anti-malware software method" is secure, unless your machine is really heavily infected and they got into the BIOS, then it's likely all over, toss the machine as you can only flash the BIOS now from within a installed OS, the infected one. 😁

AppleDavid wrote:

How rare is it for macs to get keylogged...

Only if you install something from a questionable source or allow someone to have access to your machine.

and viruses.

Really rare, none for OS X so far, only a handful for the old Classic OS. A few OS X Trojans though.

Also, how would I know I have any.

You wouldn't, until something strange started occurring and someone here would tell you how easy it is to dump your whole OS and start over.

Lot eaiser to fresh install OS X than Windows, just the OS even.

Security companies and people messing around on the dark edges report new malware findings, it rarely makes it into the mainstream Mac users. Info flashes across the Internet instantly, malware on a secure system like Mac hardly stands a chance.

And if something like the MacDefender trojan gains a large foothold, Apple grabs a copy of it and produces a definition update for Xprotect, so your protected on all your downloads.

Mac users who run anti-virus never have anything popup, it's usually a false positive if it does occur.

And even if you get one, it's no big deal you make backups anyway, it's a cinch to install OS X and your programs and then just clean the files and return them.

It's not like Windows, OS X is easy to reinstall.

You can find more information on this topic in my Mac Malware Guide:

http://www.reedcorner.net/guides/macvirus

You're getting good advice so far from ds store, though.

(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)