Hi, I already scanned my laptop using Avast! and there is no threat found. I remember having this very same problem with my other laptop a long time ago and asked help via an online forum. The guy who helped me had me run ComboFix and do some stuff and it is fixed. Now, I'm not quite sure if I still should run ComboFix since I know it's not safe to use it without proper knowledge.. I don't know if I have already given enough details but the only thing I observed is if I right click at anything, the Windows installer comes up then it tries to install something with a "Shredder".
Also, I would like to include here my other problem with my laptop. When my friend borrowed it and inserted his USB flash drive, the keys "5, 7, 9, -, and the bracket symbols" don't work anymore. Do you think it is a result of a virus infection? Because right after he used my laptop, the keys suddenly don't work anymore..
Thank you in advance.