Old laptop HP win7 32bit was not updated more than an year. Auto updating doesn't work so the only way is downloading the updates manually and installing them using windows standalone installer one by one. So the computer works much better and faster but there blinking black screens that appear at starting. After the win logo few black blinking screens than black screen with cursor after that welcome screen than again blinking black screen and the computer starts and works fine. Same problem at shutting down. So my question is should i continue installing updates? Also i disabled avast twice to install net framework security updates. Thanks for any help.