Twitter Attack tried to scan computer but...

Hi everyone I’m new here and need advice. I’ve deleted my twitter account due to to attacks and tried to run a scan on my computer. Avast says scan complete but I don’t even think it gets underway. I’ve tried the short and the long scan and both come back instantly as complete where they usually take much longer. Should I be suspicious?? :-[

Don’t worry, I didn’t realise Avast was updating so sorted now :-[

yes you should be suspicious.
please provide more details about your operating system,avast version,how long you’ve used this version,any other security software on system,any previous security software,…?