ah. my apologies and thanks for replying my thread. actually i didn't know how to phrase my question because of its weird nature.
so yea. i realized that after i restart my computer, i can open ps, open files and edit them normally. but after sometime or if i open a web browser, i am unable to open any picture files or do any edits on it. ie whenever i drag or open a file in PS, nothing appears, just the normal grey backdrop. furthermore, if the "thing" happens in the midst of my pp, i am unable to open any adjustments, ie i click levels and nothing appears. the same happens with the actions, where it just stops at that specific adjustment segment. so if i want to do any adjustments, i'll have to restart my computer and open ps the moment its done and have period of time to edit before everything becomes haywire again.
i've re-installed it countless of times, downgraded/upgraded from ps 3 to 4 and 4 to 3, discarded all preferences using the cntrl alt shift method etc. but can't seem to fix this problem which is kinda fustrating when i cannot do any edits without going through that tedious process.
thanks to all your replies in advance!