What's going on???? My computer?? Help!!?

-Yesterday night my computer was acting slow more like my web browser but I didn't do anything about it

and today I checked my facebook and I saw like 8 pages that I supposdly have liked.. is someone hacking my computer? or is it a virus?? help?? what to do??Run virus scan, preferably MalwareBytes. Then change your facebook password, but be sure to scan for viruses first.
may be a virus.