Merged thread with the same topic with this one.
These things are usually molehills being made into mountains. Just keep your anti-virus and anti-malware stuff current. Do maintenance/cleanup on a regular basis. You will be fine.
If you do not have any anti-virus or anti-malware stuff then by all means
get them. There are a number a great tools of this kind out there that work very well and are
free.
Avast!
Malwarebytes
Spybot Search & Destroy
Microsoft Security Essentials
To help with maintenance and cleanup...
CCleaner
Defraggler
Revo Uninstaller