Taskbar application issue (includes a video clip)

i am having this verry anoying issue where when i click Anything / applications etc
that is minimized, its impossible to make them maximise.

i did google searchs for help regarding this and all i could find was different task bar issues and not mine..

i am getting really pissed off of this i never had this happened with any other windows

[i am using windows 7 64bit btw]

i have recorded a little clip of me trying to maximise msn messenger windows
to make all of you see for your self whats happening

i know the video quality is shitty but.. i made it the lowest rez to make it a small file to upload quiker

heres the link:

task.mp4 video by harmony1981 - Photobucket

i really hope someone had this problem and got it fixed because am verry tired of this

i thank you all verry much for the futur reply's ill get



best
regards

Jeff

unfortunatly no i cant use system restor because i never use this to save.

as for the "safe mode" i cant tell i didnt try .

you see when i start my pc it dosnt do it. i can be a month without that problem or simply a few hours. never know

then all sudden, BooM! it starts to happen i dont want to format....

there is something i do or click on that causes this and i really want to know what
the cause is

its disabled. and even if it was active i wouldnt of used it.
ive had this problem far too long to restor to any previous date.

thats the problem. i have no idea when this started all i know is that it wasnt recently it was a while back and i keeped on rebooting to fix the prob. but now am fed up.