Welcome to Manager. I can see that you just recently joined, so I assume that you are looking to trial out Manager and are naturally concerned about Manager.
I am an IT Company that started using this software about four months back and I am very pleased with this software. Click on my name and have a look at my posts, especially the feedback one and a couple of the earlier ones. In short, I find the program so easy to use and with a very good UI so the program is intuitive with a very low learning curve.
As an IT Technician I have seen various different legitimitate software being flagged up as potentially having a virus. With legitimate software in virtually all cases it usually is a false alert. Anti virus products are not 100% perfect - they somtimes get it wrong. The developer mentioned a few posts back that Manager periodically connects to the Internet for the purpose of letting him know how many active users there are. This may be the cause of the virus alert - although I suspect a firewall alert is more likely what happened than virus alert.
I would not base your opinion on the software by a single review of the program as people statistically very seldom post a positive review but are very quick to write a bad review when something goes wrong.
This program is very easy to use, has a simple modern looking gui and basically does almost everything that I want and the features that are lacking are coming in future releases. The program is updated almost weekly!
Here is my review of the software
Feedback
and here is the developers response to a similar concern like yourself
[virus Alert][2]
By all means if you are concerned, upload the file to an online virus checker and see what they say and then perhaps the developer can respond to any false alerts. I do agree that it would be in the best interest of the program to prevent false alerts from occuring in the first place, however I believe that the issue is the fact that Manager contacts a website periodically to give the developer an idea of active number of users, but perhaps this process needs to be improved if anti virus scanners are picking up something that they should not be.
give the program a go and see what you think.
[2]: Norton 360 Deletes Manager.exe - #2 by dalacor