bootable USB for virus and mal scans?

[Burgertime]

My wife may have allowed our windows 7 machine to catch a virus - it's acting oddly. I can easily download AVG or equivalent and it may or may not find and fix the alleged problems. However, I was wondering if there is some sort of bootable CD or USB setup I can create that will scan systems for viruses and malware without even loading the OS? I downloaded and burned Hirens Boot CD but when I chose the bitdefender virus option, it said there was no media or some error like that.

Is there such a rescue CD/USB setup that I can boot into, which will then update virus/mal defs and then scan the hard disks?

Thanks!

 

[scout_03]

avast free have a start up virus scan module before the os get on .

 

[Dark Lord of Tech]

http://www.superantispyware.com/portablescanner.html
superantispyware portable

https://www.malwarebytes.org/chameleon/
Chameleon

 

[Burgertime]

http://www.superantispyware.com/portablescanner.html
superantispyware portable

https://www.malwarebytes.org/chameleon/
Chameleon

Thanks! I'll check all of these out!

 

[Dark Lord of Tech]

Superantispyware is decent.