Laptop keyboard malfunction

hey guys its my first time posting here, i would just like need a help and advice i have an acer 4750g laptop with an i5-2410m 2.3ghz with turbo boost up to 2.9ghz (but usually just around 2.7ghz if all cores are stressed) and with a dedicated gpu nvidia gt540m 2gb vram.

my problem is yesterday when i turned on my laptop i recognized that it was taking so long for the start up to be finish but i didn't know it was freezing (it was taking me awhile to notice) then i was scared if my laptop is broken then i accidentally pressed *enter* then it continued to my log-in screen and i was able to open my laptop but another problem appeared when i try to do something or play something when i hold one key ex. letter H the programs or games i was using freezes if i don't release the key i was holding and sometimes when i type something even though i pressed *space* the blinking thing when you type goes back at the start or everywhere.....

so please if anyone had any encounter with this problem help me i can't play any games and it annoys me that i need to keep pressing *enter* to just pass the start up screen and the CPU usage is sometimes spiking even thought im opening the taskbar no program was running with high CPU usage

i tried every solutions in the internet like opening the device manager and un-check the box in a usb root hub power management and uninstalling the standard laptop keyboard device and installing it again but it didn't work also..... so please if anyone knows a better solution please.... please help me