windows 7 changes

Hallo all, my system property changes. I am using Chrome browser and one day, I was not able to print. So I changed to I-explorer and here was print fine working. Any time ago chrome was again able to print like before.
But now I can not start the Internet-explorer . When I click the icon , the explorer will not start. Also I found today that the USB safely remove shows nothing. Some kinds of sticks can be requested to remove over computer/disk/ right mouse click and eject, but some mem-sticks does not allow this possibility.
Also I can not pair a LG Android phone over BT with my NB. The phone dedects the NB and the NB ask for confirmation. When I confirm, on the NB nothing is happen /no confirmation code is shown/and the mobil shows / not paired repeat pairing. So I can only via USB connect.
I would be glad for a hint, because I am only a simple user and not a IT-specialist.
Thank you for your response!
Kokavcan

Are you using 2 real-time anti-virus programs, AVG and MSE (in your specs)?
More than 1 real-time AV can cause problems.

Hi, thanks for your fast response. Yes it is true I have installed MSE and AVG. I will check it, by removing in ex. AVG.
Have a nice evening!