I'm really really sorry for you. I had to pay also (more than a month ago), but for me, the moment i copy-pasted the bitcoin transaction id i got the decrypt.zip file... However it was a crappy decrypter (many .bak - database files backup from an application) were corrupted, the pictures showed strange horizontal lines (like a 95% complete decryption with errors). Of course, i decrypted only on copies, i still have the original HDD with the encrypted files, i just installed a new windows on a new one. So i wrote on that silly support page and i complained at them that the decrypt doesn't work as it should. After about a week i downloaded again the decrypt.zip file and the CRC was different, this time it worked.
Try and try again to go into your page (i've tried but didn't connect) and see if you can download your decrypter archive. If you can work only on copies, make (maybe with norton ghost) some clones of your hard drive, write files on cd,s dvd.s (i mean the encrypted files you need), and work on them on a computer with another hard disk in where you don't risk anything. If you don't have another hard disk, try the decrypter (the antivirus shows is infected) on a computer with deep freeze installed, so after restard you can be sure you have no viruses...
Finally... pray ! Pray that the page will get back and you'll get your decrypter back.
Another very very slowly solution (and probably the only one for this virus) is to work on virtual machines, get purposely infected and get the decryption page. You can upload there any file encrypted with any key (that decryption test page) and it will decrypt (they probably check the encryption key on a server database, but it works). However,.... you need to have just files lower than 512 KB.
Any other solution you'll find at the time i'm writing this is NOT working ! Recovering files is impossible, since they're secure deleted with crazy rewritings on hard disk. the most you might achieve is to get infected again, and that's a nightmare, i know...
I'll be praying for you.