OP: have you tried Coinbase? They have an "instant-buy" option if you verify your account with a Visa or Mastercard credit card (along with verifying your bank account).
I'm not sure how long the verification process takes as its been awhile since I did it. If you don't do the instant buy method, the turnaround time for receiving BTC is 4 business days.
As others have said, it is difficult to buy bitcoins with your preferred payment methods (paypal, MC) as they are reversible, bitcoin is not.
Why are we giving OP advice on buying bitcoins? I could have missed something, but is this advice so he can pay the ransomware?
OP you should in NO way pay the ransomware. I gave my advice in a earlier post on how to get rid of it most likely. Does your company have a help desk area that can help you? (I did helpdesk work once and removing virus's was normal. Would not lose your job liked you talked about).
If no resources at work, and cannot do it yourself. Look into places that fix computers vs paying ransomware.