Virus

[charisma]

I think I may have a virus on my macbook. Is there a safe and free program to check and clean it?

 

[simsaladimbamba]

ClamXav is a good way to check your Mac for MALWARE:

Currently there are zero viruses affecting Mac OS X in public circulation, but there are other kinds of malware existing, that can infect your Mac, but that can be avoided via employing the proper security steps without the help of any anti virus software.
To learn more about malware in Mac OS X and what steps can be taken to protect yourself, read the following F.A.Q.:

Mac Virus/Malware Info by GGJstudios​

And you should really give some thought into your next thread title.

 

[charisma]

The only reason I think something is wrong. My computer restarts on me. first it freezes a couple times. then reboots.

 

[simsaladimbamba]

The only reason I think something is wrong. My computer restarts on me. first it freezes a couple times. then reboots.

That is not a sign of malware, more like incompatibilities between hard and software (wrong driver, bad OS X version for your MacBook, ...) or even a hardware fault.

Does the crash look like a Kernel Panic:

About "You need to restart your computer" (kernel panic) messages
Resolving Kernel Panics
Mac OS X: How to log a kernel panic