I downloaded MacKeeper, and it told me my computer was at "serious" level for viruses...HELP what can i do? do i even trust it? or is it tricking me into buying their product to get rid of the "viruses"? It just scanned my computer it said.

See here > Beware MacKeeper

Uninstall MacKeeper

http://applehelpwriter.wordpress.com/2011/09/21/how-to-uninstall-mackeeper-malwa re/

Ignore it. If you want to perform a virus scan and get results you can trust, use ClamXav or Sophos.

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3rd Party AV Software is Not Needed... See Here > Antivirus Discussion

Mac OS X tends to look after itself... To keep your Mac Happy...

See Here...

http://support.apple.com/kb/HT1147

http://www.thexlab.com/faqs/maintainingmacosx.html

Mac OS X: About background maintenance tasks

Are you seeing something like this?

Note that I got that screenshot from a copy of MacKeeper running on a clean install of 10.8.2, with absolutely nothing else installed. That should tell you exactly how "critical" these issues are. 😉 It's a ploy to get your money. Uninstall the software ASAP.

If you're concerned about malware, see my Mac Malware Guide, and if after reading that you want anti-virus software, only use one of the ones it recommends.