What other security related software do you have on this machine including antivirus (AV), firewall (FW), and other security software? Did this new machine come with a trial AV on it? If you had previous software on it, how did you remove it and what was it?
If you check under Control Panel > Add/Remove Programs > what comes up for AV and FW programs? Does Avast show up?
Having 2 resident (running all the time) AV's will often cause a conflict, so please report back on the questions above. If you need assistance in removing a software, we can help you with that as well.
In addition, so that we can help you better, please go to
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Signature. Enter information about your system like the Operating System (OS), RAM, browser, security software, what version and product of Avast and firewall you use and other items you wish to mention. See my signature or others as an example. Thank you.