I have been in the PC support end of things at a large insurance company for the last 25 years.
I'd suggest you first go to www.superantispyware.com and download\install the free version. Do a COMPLETE scan. This is one of the best antispyware programs around! It has found "bad" that both McAffee and Norton can't. The free version will have to be run manually, about avery other day.
For an antivirus program, if you don't already have one would be AVG Free Antivirus. You can download/install the free trial version at;
http://www.avg.com/us-en/trustav_bt_ppc?ECID=ad:go:se:US-EN-SCH_AVG-Free&utm_source=google&utm_medium=cpc&utm_term=avg%20free&utm_content=&utm_campaign=US-EN-SCH_AVG%20Free&gclid=CIOVsaiMjLgCFcOh4AodIV0AJwI strongly suggest others give it a try as well.
Thanks