try this:
First, hit ctrl+shift+esc, tell me if it brings up the task manager or not. Close it out if it does. Then:
restart the computer and hold the F8 key as it starts up until it asks you if you want to boot safe mode.
Choose the Safe Mode with Command Prompt. In the command prompt, type
followed by
then see if everything works like it should in safe mode.
this is just a test to check if malware is the problem.