I had a financial transaction on an business account that I did not enter. The tech services people told me it came from from my PC. They are a big company as opposed to a small 'mom + pop' operation. They suggested I take PC in to a Big Box store to get PC scanned and remove any virus/malware found. Contacting the big-box store they said they could scan my PC remotely to look for virus/malware. So, my question is: Should I take pc to local computer experts/big box store or purchase virus software to use myself? I do have several free virus protection programs on my windows PC.