Use any of these ten sites to scan your PC for problems.
With so much technology becoming cloud based, it's no surprise that the companies that create anti-virus software are moving right along with the trend. This article from the beingPC site has a good list of companies that have online scanners.
Several of the companies listed are familiar and likely to be recognized by many. Most of the scanners install some type of software on your system (usually small) so the online scan will work, so it's a good idea to backup any data that might be lost (along the lines of "not likely to happen but better safe than sorry" idea). Just a note, scanning takes more time on slower connections, something to keep in mind before you start.
Scan your PC online for viruses
Number two on the list, Windows Live OneCare, has been discontinued.
11-16-2014 Updated article
Signing off for now,