My MacBook Pro May Have A Virus - What do I do?

Hello,

I think I may have a virus on my Mac. This is embarrassingly my own fault. I opened an email and an attachment I should not have opened.

Now, everything is achingly slow and I can't attach things to any email. My MacBook Pro has all my financial stuff that I cannot afford to lose. I am afraid to back it up with the risk of just putting the virus on my hard drive. I do not know what to do. Can you help?

Model Name: MacBook Pro

Model Identifier: MacBookPro9,2

Processor Name: Intel Core i5

Processor Speed: 2.5 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache (per Core): 256 KB

L3 Cache: 3 MB

Memory: 4 GB

Boot ROM Version: 222.0.0.0.0

SMC Version (system): 2.2f44

Sudden Motion Sensor:

State: Enabled