Assuming your system restore points aren't hosed you can try shadowexplorer to recover files before the infection date. If that fails you could search for a tesladecrypt tool that works with your particular variant of the malware.
No issues with flash screensavers on my Win 7 x86 SP1 box using EAV 9.0.349 & swf20. Try using the flash uninstaller and the standalone flash 20 installer.