At the moment I am bombarded with adwares and popups and all kinds of annoying things and I have probably done more Antivirus scans today than anyone has ever and it seems that a browser extension called BuyenSave or something like that is the cause. There are like three extensions of that name and I try to remove them, but they come back. I've looked online to find the solution, but I couldn't find anything concrete.

If anyone has had this problem and if anyone has managed to solve it, help would be much appreciated.

1. Download "Ad-Aware" http://www.lavasoft.com/
2. Start windows in "Safe Mode" (hit f8 before you get to starting windows screen)
3. Run Ad-Aware (full scan)
4. Remove any shite it finds.
5. Reboot.
6. Your problem should be solved.

I have Ad-Aware and I will try your advice, thanks Kelly.

Failing that, try reading through this:

http://www.malwareremovalguides.info/remove-buynsave-adware-pup-optional-buynsave-a/

Unless there's a very good reason not to, I'd suggest backing up the few bits and pieces you consider valuable and going for a full reformat. It's no harm to give a machine a good cleaning like this if it's starting to get a little old and slow, but after getting hit with a nasty dose of malware or scumware it's certainly a good idea. 

Find a good guide on doing it before you start. Make sure you know what the licence key is for whatever OS you're using. Try to have a spare machine nearby in case you need to grab any additional drivers. Then you can start with a fresh new OS that you know is 100% clean.