and download the wifi drivers; then run and install them...
Don't understand your comment:
There is a yellow exclaimation mark only over the ethernet connection
A yellow exclamation mark usually means a problem with that item. Yet you appear to say you can connect OK with ethernet/cat-5 connection at least?
Once you are able to use wifi again strongl advise you to:
Make a restore point.
Develop the habit of regularly copying/duplicating "all" your personal files etc. off the system entirely - typically to DVD; and if possible to an external hard drive too. Check the copies are truly accessible on at least one other working system. Keep them safe and regularly update them too. Then should you ever have problems in the future - that may result in loss of access to your personal files etc. - they are safe elsewhere.
Also make an image of your drive - and keep it safe. Useful to have around in-case you ever need to rebuild it and keep all you apps/utilities etc which were installed after you received the Samsung. This does not mean you can't use the built-in recovery routine; but be aware that "will" wipe "all" your personal files in the process, and any add-ins you made after receiving the Samsung...?
And also at intervals make a fresh Windows Restore Point too; as then you can always back to a previous time if needs-be (and this is one where that option might have been useful).
message edited by trvlr