One, Even off the internet, that computer is infected and can not be connected to anything else.
Second you will need to obtain new Office software if you no longer have the Disc for it.
Was the computer bought with or without Vista/Office already installed? Or did you buy Vista/Office separately?
If it came with the items already installed, my best suggestion is contact the maker for recovery options.
Lastly, without the key that was on the Vista Box if you bought it separately, you need a new one to install it again.
Can you give me the Name and model number of the computer/manufacturer?
Please answer the above about the computer model and if Vista was already on it when bought.
When that is done, I'll give you some information for future security for when you are ready to go again on the internet.