Laptop may have virus from external hard drive?

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I had a Dell laptop for about 2 months, then it started to slow down one day, programs would open slow, antivirus (AVG and Kaspersky at the time) would not complete virus scan, sometimes slow internet page loads with DNS errors. I ran a scan from BIOS and found it had a bad hard drive (could explain why I couldn't transfer large files to my external drive, it would freeze), so long story short I buy a new Asus laptop instead. It's fine, but then I transfer some files over back from my other computer, and now this new computer is slow and sometimes freezes when you try and update AVG or the anti-virus installed as a trial. Files transfer slow, windows, programs open very slow. I finally updated the virus programs and scanned the external drive and found nothing. I don't believe it, something is wrong like before. Is there a way I can reinstall windows ? What would you check out first?

 

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Not sure if I'm reading right, but are you running two antivirus programs at the same time? If so, uninstall one.