Answer:
While there is much free software on the internet, there is also a great deal of malware disguised as freeware, or coming from sites that say they provide freeware.
Before you download any software be certain that you have good and current virus protection installed to protect yourself.
Some good freeware sites are sf. net and nonags. com
Sourceforge is primarily open source, Nonags is software that is tested and nag/limit free.