Why am I getting an error message when I try to use the apploader?

I 'used' to use my blackberry 8700 until i just not used it for 5 months and now it's stuck on the so called reboot loop. I tried updating the OS on the Desktop Manager but always get stuck on reconnecting to JVM. I tried the apploader but when it loaded to where the files to be installed can be chosen it showed a message instead: "The Blackberry Desktop Software does not have Blackberry Device Software for the device that you have connected to the computer. Contact your wireless service provider or system admnitrator".

Help???