Current installation of 10.03 with XP Pro is only a few days old. There are a few things that MUST be done before installing 10.03. You must REMOVE any earlier version of Winfax and/or any other faxing programs, especially the little cheapo's on the market. You MUST DISABLE any programs access to the modem which usually occurs upon boot-up. If any program is accessing the modem the program will not install. You SHOULD disable any virus software running. Disconnect Internet access to protect from a virus while disabled. Go to program files (after you've removed Winfax or any other programs) and delete any signs of Winfax including Symantec/LiveUpdate. Restart your computer so that it is totally clean. In XP, set a restore point should you have any problems (but you shouldn't). Then run the Winfax installation. It should go thru just fine but I guarantee nothing. The reason I rate it as 4 stars is because of all of the things that must be done BEFORE you install the program. If Winfax would do all of these things for you, I would rate it 5 stars. If you get a bad or incomplete install, the program and your computer will cause you headaches. It is necessary to do the things I've mentioned. I'm a Winfax user for many years. The other programs are just "toys".