PC freezing

Hi and Welcome

Moved your post from another old thread and created this one for you as not all issues are the same.

So some questions for you, to give us an overview of what could be happening.

1. What Windows version and Service Pack are you using?

2. When did this start, did you just install a new program or driver and if so what was it?

3. Why is the need to uninstall Adobe Flash? is this what you believe is the cause of your problem, if it is then the below should help.

4. Have you booted into Safe Mode (F8 at boot and choose Safe Mode with Networking) and see if your PC works ok.

5. For your comment on "Unable to get rid of threats." do you mean malware as in virus and trojans? if you do and this could be part of your slow running PC then do follow the below as written and also start the mentioned new thread in the malware forum area with your attached logs from the scans the guide collects.