Spy sweeper - break the code

When we pretended to be spies when we were kids we used all sorts of codes and message systems. Today Spy-sweeper software has set us the task of deciphering the following secret code:
SHX OGUONPR ZI RWP MAEJ ZUSBO-VCJSFPX OPKJCBLUSBP SGDURMPR
Now, you are going to need some help, so pay a visit to the code-breaker:
http://www.secretcodebreaker.com/autokey.html
find the key to unlock the following message (clue: start at the beginning of the alphabet!)
SPY SWEEPER IS THE MOST AWARD-WINNING ANTISPYWARE SOFTWARE.

I am old enough to remember the days before anyone but the most geek-some even knew what the internet was…then everyone was on it and the revolution began. Soon everyone had an email address and a homepage, and then came the computer virus… not everyone took the threat seriously until they were hit!
Then came spyware, now a lot of people don’t appreciate the difference and think that if they have anti-virus software then they are covered but NO… Spyware is not a virus and is generally not detected by anti-virus software and that is why we specifically require anti-spyware software too.

Spyware will not delete your hard drive, email all your friends and post rude messages on your screen, but it WILL record your keystrokes and lift your passwords/financial information and slow your PC right down in the process.

Don't be caught out by spyware working away in secret on your PC, please, please make sure that you have anti-spyware software on your PC and get it right now. You can start by visiting the Spy Sweeper website. They offer the most complete solution to rid your PC of all the unwanted spyware, and I bet that you will be shocked just how much you find!!