Civilian Aviation

I've been using FS9 for years with no problems yet today when I switched my pc on and clicked on the FS9 icon I got an error message saying "Please login with administrator priveleges and try again". Never seen this before and I haven't changed anything on my pc. Any ideas on how to get around this please?

Bit of a belated reply, but right click on the desktop icon, and select "run as administrator". Should work, its a common thing for fs9.