If none of the plugins you normally use are working then I would:
Also to make sure you didnt accidently put the autoloading plugin directory in the wrong spot when you installed...
You can click on your start button (windows button). Type regedit in the search programs and files box and open regedit. Expand the HKEY_LOCAL_MACHINE folder, then expand the software folder, then click on the avisynth folder. This will show you where you set the autoload directory when you installed incase you changed it and forgot. If its not where it should be then just click it and modify for the correct path.
"The people cannot be [...] always, well informed. The part which is wrong will be discontented, in proportion to [...] the facts they misconceive. If they remain quiet under such misconceptions, it is lethargy, the forerunner of death to public liberty. What country can preserve its liberties, if it's rulers are not warned [...] that this people preserve the spirit of resistance? The tree of liberty must be refreshed from time to time, with the blood of patriots and tyrants."-Thomas Jefferson