My computer is really slow,pages won't open or close at a reasonable speed,system seizes up,letters are skipped when I'm typing.If I do a regular scan Avast says I'm protected & there's no infection.Perhaps my definition of boot scan is wrong.So to try & find the problem I try to do a scan with Avast with the computer in safe mode.This is how I was shown how to find a particularly tough problem to deal with.Avast says it's not on,the system is not secured & to restart the program.This is not an option as I can't click on either of the links to restart the program or turn it on.When I try the same boot scan with Malwarebytes anti-malware it starts scanning normally at 1st, you can watch as it rolls through the files numerically,then after a couple of thousand files,it jumps to 30,000 files scanned in an instant & the scan takes a fraction of the time it should. I believe a program has been inserted underneath everything & protects itself .Avast isn't allowed by said program to work in the boot scan as it will detect & delete said program.When I 1st noticed this problem,I poked around & found my firewall had been turned off some how & a promt came up saying a script was running too slow & could cause my system to crash & did I want to close this unnamed program.I closed the box instead of answering yes or no.At this same time Avast said in regular mode that I wasn't protected, so I tried uninstall/reinstall.Thanx!