clipped from: www.securityteacher.com Do not download and run files obtained from unknown or suspicious resources. If you absolutely have to, make sure you scan the file with as many antivirus scanners as possible prior to running it; as an alternative, provided the file is small in size, send it for virustotal.com analysis.
Remember that files can equally be good or bad, and much of the outcome depends on the reputation of the source site. You’re pretty much guaranteed to get a clean file download from a known vendor such as Nvidia distributing new driver update, but at the same time face a huge risk when downloading a purported “codec” file from an unknown underground site. Typical malicious file would accommodate no more than 50K in size, so be particularly vigilant to such files.