Solved I suddenly cannot open files

[Kimarae]

Suddenly today, I find I am unable to open most files. JPG, PDF, DOC, XLS all are claimed to be unknown format or damaged. Not ALL files mind you, just most of them.
I have tried several different programs to open them with the same result.
I have created new files and have no trouble, only files that existed before today seem affected. Something malicious has got at them hasn't it? Can I save anyting do you think?

 

[ThrashZone]

Hi and welcome to SevenForums,
Review Jacee’s instructions to run Adwcleaner here post #7,
Ignore the title of the thread,
http://www.sevenforums.com/system-security/316404-instant-savings-app.html
View attachment 354642
You can use these free tools to see if they find anything,
Manually Update them before running full scans,
Try not to use your computer while the scans are running, (one at a time of course).
See this tutorial on how to download and run Malwarebytes,
http://www.sevenforums.com/tutorials/338716-malwarebytes-anti-malware-free.html
Also use the Custom scan option not the Threat scan,

Please Do Not clean/ Delete or Remove Any detections before posting the scan results first before review especially Malwarebytes,
http://www.malwarebytes.org/products/malwarebytes_free
SAS is safe to remove anything it finds
http://www.superantispyware.com/?tag=SUPERANTISPYWARE
This one is the longest up to 4 hours, the others are only about 45 minutes,
http://www.microsoft.com/security/scanner/en-us/default.aspx

 

[Kimarae]

Thanks, ThrashZone.
Turned out to be Trojan.Cryptolocker. I got rid of it easily enough, lost a lot of files though. Must remember to back up more often.