Recently, hackers got into Symantec and downloaded source code for older versions of their anti-virus product. They also got a hold of the code for PC-Anywhere. It is a program that allows you to remote into your systems from other locations. However, there are several vulnerabilities with this program and with the recent acquisition of this code by hackers, there is a genuine fear of unwanted individuals getting access to machines.
If you have the program, please uninstall it. There are several other programs and services (many free) that serve a similar purpose. At Renascence IT, we can recommend what would fit for your company. If you don't know if you have PC Anywhere, contact us and we can promptly assist!
More on the actual alert:
Renascence IT Consulting 