Welcome to TechSpot! There are several rogue malware programs very active now- some have similar symptoms.

Your files are not gone, just hidden by the malware. Please go back to Folder Options View tab and recheck 'don't show hidden files and folders'> then recheck 'hide protected system files (Recommended)> Apply> OK.

Now run the following:
Download Unhide.exe and save to the desktop.

• Double-click on Unhide.exe icon to run the program.
• This program will remove the +H, or hidden, attribute from all the files on your hard drives.

Note 1: This does not remove the malware- only the attribute causing the 'missing' problem.So it is important for you to continue.
Note 2: If you are infected with System Check it is important that you do not delete any files from your Temp folder or use any temp file cleaners

If you have any problem running any of the 3 scans, stop and tell me what is happening, so I can guide you. Getting this preliminary information and reviewing their logs will help me to help you.

Please leave the logs in your next reply.
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If you would like us to check the system for malware, please follow these steps: Preliminary Virus and Malware Removal.

NOTE: If you already have any of the scanning programs on the computer, please remove them and download the versions in these links.

When you have finished, leave the logs for review in your next reply .
NOTE: Logs must be pasted in the replies. Attached logs will not be reviewed.
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My Guidelines: please read and follow:

• Be patient. Malware cleaning takes time. I am also working with other members while I am helping you.
• Read my instructions carefully. If you don't understand or have a problem, ask me. Follow the order of the tasks I give you. Order is crucial in cleaning process.
• If you have questions, or if a program doesn't work, stop and tell me about it. Don't try to get around it yourself.
• File sharing programs should be uninstalled or disabled during the cleaning process..
• Observe these:
  [o] Don't follow directions given to someone else
  [o] Don't use any other cleaning programs or scans while I'm helping you.
  [o] Don't use a Registry cleaner or make any changes in the Registry.
  [o] Don't download and install new programs- except those I give you.

If I haven't replied back to you within 48 hours, you can send a PMwith your thread link in it as a reminder. Do not include technical problems from your thread. Support is given only in the forum.
Threads are closed after 5 days if there is no reply.