New comer needs quick help people  

Salam And Hi Every one.
I am a uni student and need serious help as i have some pending work and no time so any help would be great and illl be very thankfull.
I started having issues with my windows 7 on my dell inspiron6400 like the mouse pad stopped working and finally the windows could not start i tried to do a system resotore but it did not work. Finally i downloaded windows 7 and made a bootable usb hard drive and installed it on my pc. I had to format the C: which still had the previous windows.
The problem is that the mouse is still not working even an external usb mouse is not working. Its not even detected. But a usb is detected. And the screen resolution is poor like an old version of an OS.
I am suspecting thatr all the drivers got washed when i formatted the C:
Does some one know what can help I really need help right now.

Best,
Haris

Thank you

The Howling Wolves

AND

richc46

guys ill try and let you know. Is it certain that this "is" a driver issue??
How do i do an all driver update?

Oh My Sweet Pajymas
I have changed the port and the mouse is working now.
I cant believe i was up until 5 in the morning trying to solve it by using tab million times on the internet explorer
Thanks Orbital Shark
now all i have to do is to get the drivers i guess

Thank you every one for helping me out. i think i have fixed the resolution issue and i have tried playing some music so i think the drivers are working now. Just one more inportant thing.
The mouse is acting weirdly, when i connect it to a particular port it is detected and starts working but then stops responding and does not work any more, also, the buttons stop working at times, the click buttons, and i havee to use the touchpad buttons which work ok. #Could it mean that my external mouse is faulty and my touchpad is not working excpet for the touchpad keys