Welcome to PinStack shifty123.
Check out the revelavant links on the BB FAQ & Guides page for where to get the latest OS for your carrier/device and how to update it. The specific ones you will want are BlackBerry Desktop and Device Software Download Sites and How to: OS 4.x Upgrade for your Blackberry.
If the procedure in that last link doesn't work, which is likely but try it first anyway, you'll need to follow the procedure in this thread, How To: ReInstall OS When Computer Won't recognize The Device Is Connected very carefully.
Let us know if there is anything else we can do to help with this problem or your BB.