Suddenly system will not extract files

[vanilla awesome]

I am running windows 8.1 on a 64x system with a intell processor, no overclocking.

I have done a search and others have had similar issue but none quite the same and none of their solutions have worker, albeit i have not attempted a system recovery.

To make a long story short, I had a zipped file that I extracted with 7zip that worked fine. Logged onto my pc today, the extracted file was gone but I had kept the original. Attempted extraction but got an error message telling me it was corrupt. I went ahead and deleted the file, re-downloaded it and extracted again. This time no error message only there was now a duplicate zip file in the folder that had a larger file size... still zipped.

At this point I downloaded a zip repair tool but it couldn't even find the files, it can find other zipped files fine but not this one.

The only thing i can that has changes between now and when the file worked was that I downloaded a different piece of software but it was marked as safe and had many successful downloads. I officially lost at this point.

Any suggestions are appreciated.

 

[basroil]

"The only thing i can that has changes between now and when the file worked was that I downloaded a different piece of software but it was marked as safe and had many successful downloads."

Sounds like that software was not as safe as you thought? Corrupted files are usually just corrupted files, but there's also a slim chance you simply have a cryptolocker virus on your system.

Best thing to do is install proper anti-virus software (the main brands, paid) and malwarebytes, and do a full system scan just in case.