I can't remember if I mentioned this before, but when the executable is packed for security, an anti-virus program MAY flag the executable BECAUSE people who do create malicious viruses MAY compress their virus the same way I compress the executable for copy protection. The reasoning behind that is if someone malicious compresses their known malicious code, the antivirus program may not flag the executable as a virus. I assume your anti-virus program is keeping you aware of something behind-the-scenes that may be malicious, however with Weatherscan XL you should not have to worry about anything. All operations that Weatherscan perform is all contained within its directory.
Enjoy!