Cant load avisynth.dll

ok here is my problem I just downloaded adware and ran a scan and it found 4 files and I next and it deleted a file named avisynth.dll I tried to use my program AVStoDVD and it showed errors saying it couldnt load avisynth.dll so I downloaded the file and put it in my system folder but one was already there so I moved that else where and pasted my new avisynth.dll and tried the program again and still the same error message so i pasted it in my drivers folder and AVStoDVD folder and still nothing reinstalld the program and still says the same thing all my other programs work fine but this one it worked before I deleted that file. I even put back the first file and still the problem is there can anybody help me at my wits end!

Thanks any help

Try a system restore to when it worked.

cant do system restore cause it only goes back to the day after it got deleted vista not like xp where it gives you a calender anyone else have any ideas?

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