No, it's official!
Downloading software from the internet can cause viruses, but is not a given. If the software is from a trusted source, and the user has adequate virus protection on their computer, then an infection is unlikely.
No it's just not good for your computer because it can cause viruses.
Only if you got the free version (web browser only) from minecraft.net the official web site of Minecraft.
The main cause of viruses on most computers come from unprotected web browsing. The second major cause is downloading programs or attachments from senders who also have a virus on their computer.
Legitimate texture packs will not cause a virus. Of course, just in case, always have antivirus software active on your computer. (Avast!)
No they do not. What gets you a virus is whatever you download from those sites. Since downloading music is technically illegal you need to watch what you are putting on your PC as some sites could be misleading.
No oovoo can not cause viruses.
Im not exactly sure if Photoscape gives you viruses but i think i got a virus downloading the software onto my computer. I think it has a virus because when I download the Photoscape my computer shut down unexpectedly and my computer did not open again.
Unity web player can give you virus if you download it from a virus website if there is no virus on the website your downloading unity web player it wont cause viruses
Parasites can carry and transmit viruses, but they do not "cause" them.
Some can cause cancer. They are called oncogenic viruses.
Viruses can slow you down and permanently damage your PC, some viruses are less harmful and won't cause any, but it's always on the safe side to get virus protection. I believe AVG is a free anti-virus software, I recommend downloading it off a safe site like Cnet.