this is a old but quite serious virus, since you seem to be the only one reporting this on the forum it would suggest that your pc was not infected via entropia universe.
a side effect of this virus is that it tries to infect all executable files on your system partition.
if you got infected with a old virus such as this it would suggest to me that you (sometimes) disable your virus scanner and/or firewall and/or that you are using a poor quality or out of date virus scanner.
i then also wonder if you keep windows up to date.
this virus can also spread via network shares so any other machine you have in the house is likely to be infected too.
microsoft says its own malware tool detects and removes this virus:
https://www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=Win32%2fGael
there are also free virus scanners with a reasonable reputation such as avast, all this costs is registering with your email address.
after you have scanned your pc(s) with a (new) virus scanner or microsoft's tool, make sure your firewall is enabled and run windows update to make sure you are up to date i would use the repair option in the entropia universe client loader to make sure entropia is working correctly, this may ask you to delete some files, it did for me and after deleting EU still functions.
it is good practice to never disable your firewall or antivirus if a program does not work as intended, it is always best to look for a specific solution instead.
goodluck.