how to see how much anti-virus takes from memory and CPU?

"There is no one answer as it depends on what antivirus you are using.

Most antivirus programs consist of at least two lines, one being the interface / control program and the other being the actual antivirus engine / service.

I recommend you use Microsoft / Sysinternals Process Explorer, you should be able to sort via directory and find all the antivirus type processes.

However, in addition, the engine MAY (or may not) be hiding behind svchost.exe, so you will have to manually find that out for yourself as every antivirus engine is different"