acer aspire M3900G, pentium dual core CPU E5700 @ 3.00ghz 3.00ghz
64 bit operating system, intel G45/G43 express chipset
broken: Blender version 2.76b 1-29-15
working previously: blender 2.76b 1-29-15
Description of issue: view rotation via middle mouse and middle mouse+ shift panning will not work and cannot be fixed, using it the same exact day it messed up working on a project. issue has occurred several times before but seemingly fixed itself until this event. i am a newer user to blender but i only use buttons that i know the function of and follow tutorials for anything new, this issue is never caused from me hitting wrong buttons but i cannot get it fixed even with user preference changes or resets and it causes me to be unable to use blender for most things. rotation using the number pad works but mouse rotation is completely unresponsive. hopefully the issue can be figured out as i don't get what causes this and hopefully the system information is somewhat helpful i listed anything i figured might help.
Steps to repeat and reproduce: unknown i don't know what causes it as it happens randomly.