Light Anti-virus for Celeron w/ 2Gb ram

[QtrSkills]

Hello

I just got hp stream 11 for school it has Intel Celeron N2840/ 2 GB RAM
I just need a very light free anti-virus to scan my flash drive after using it on school computers. I rather something with the ability to turn off real time scan

waiting for your suggestions, thank you

 

[Jakku]

Try this. I might even switch to it.
http://www.bitdefender.com/solutions/free.html