If you're referring to Xp, then by all means, go ahead and install SP3. You should not have any problem, and your PC will be better protected against malware attacks. Gerald ----- Original Message ----- From: Bob Soutar To: jfw@xxxxxxxxxxxxx Sent: Saturday, April 10, 2010 2:50 PM Subject: Service pak 3 Hi, is their any reason not to download MS Service Pak 3? I'm using JAWS 8. Thanks