well what your saying is a little confusing since Winrar is just a compression program… inside the .rar file is the file you actually want to burn to disc.
i suggest using ImgBurn (www.imgburn.com , it’s FREE) to burn your files to disc. (MODE > BUILD)
p.s. also, in once in the MODE > BUILD section… i recommend switching the OPTIONS > File System to ‘ISO9660 + Joliet + UDF’ (if your burning a basic data disc) … if your burning standard DVD’s that play in your dvd player (which in your case dont matter since you burning a basic data disc, and even in this mode you still need other apps to convert etc etc) in general you always have to use the default of ‘ISO9660 + UDF’.