WHEN I changed my windows I receive this error 0xc00000e9(some devise connected to your camputer... ) and then I found unallocated space with 3mg size.when I use computer management for use this unallocated space I can't because when in computer management I right click on this unallocated space all the options is this abled except propertis and help.I can't delete it or do any thing with this unallocated space.I had 4 partion and my PC show 4 partion but when I want change my windows this unallocated space appear and when I choose option for format this unallocated all of them disable d except reload drive.when in computermanagement I choose propertise show this name is wdc wd5000aakx-001c0 ata device. When this problem created my PC speed is going so low.and my PC grafic going to lower quality.what is this ?is it bad sector?how can I solve it?

How do you mean Change windows? As in one window to a next like if your in word and switch to excel or do you mean tabs within i.e. or ff?

Did you re-install windows or install a new version over (or instead of) the older one? If so you have to re-install all the drivers for your motherboard and devices like video and audio. The little partition is probably a recovery partition put there by the manufacturer to recover your system in a disaster. Go to your computers manufacturer site and search for the drivers for your specific model. If you did not install the video drivers that would explain why the graphics are so low.