It does cause problems but, on my laptop, nothing I can't undo. You should be able to get a fake copy of English Windows free or cheap in just about any computer shop. Go for XP then get it unfaked, so you can download security updates etc. If you're computer savvy but stuck with Chinese Windows it's a bugger.
I use Funshion because it gives me much higher quality, unlimited, free movies than anything else I've found online. So every now and then I need to clean up after it - a price I'm willing to pay.
Happy Christmas to anyone else who's here right now (poor family gits like me, poor FTs who are living in villages, etc.) by the way!