Avast is kind of a standard antivirus choice and it really provides solid protection for a free antivirus (with a paid version being available). However, there are many various problems that have surrounded Avast since day one. One of the most common issues is Avast not opening on Windows in the least, with the none error message. avast will not open once installed. In Safe Mode, it opens, scans, but won't allow me to delete anything. Avast might fail to open thanks to many various problems. However, it’s possible to come up with a shortlist which may provide the foremost common ones which affect the bulk of users. Determining the right cause is great for finding the best solutions and resolving the matter as soon as possible.