I am not saying that the site is currently safe or not, but just something to keep in mind...
... a lot of programs that are found in the cryptocoin world are flagged by AV companies because the software (code) finds its way into (usually existing - 'plugged in') botnet software. When the victims report the infection or the box is investigated by the AV companies they just flag all the code as malicious and so it can result in false positives.
FWIW I am happy using primecoin HP releases and I have not come across any security concerns thus far.
You should all be taking basic steps to keep your coins safe anyway, like sending the majority of them to a wallet address you know is secured. Software wallet client(s) storing coins should be on boxes or at least VM's that you know are secure to a high degree...
+1
If you Virustotal cGminer, there are a ton of false positives.
AV companies really should do a better job filtering out those false positives; it gives crypto a bad name to unaware people.