Dear Grishma,
You remind me of an old saying, "If a container contains little water it makes a lot of noise." Anyway there are several options that I've listed down for you.
1. Call you computer manufacturer if you still have warranty (they might be able to fix it for free).
2. Go to Best buy or circuit city (circuit city is filling for bankruptcy they might run away with your PC)
3. Try to Google "computer repairs in (your city name here)" and you can find people who repair such PC.
4. I would not recommend this but here it is. Go to your manufacturer website and download all the drivers and save it in the disks also you must have a copy of your operating system then you can probably wipe out the entire disk and reinstall everything. But please be sure to
BACK UP ALL YOU DATA.Option 1 is the best thing to do in your case since you wont have to go through technical hassle but take weeks
Option 2 might cost you somewhere around $100 for virus removal or if you are trying to format your computer might cost you $250 + and takes 3-4 days.
Option 3 might cost you half of option 2 could be 1-2 days
Option 4 wont cost nothing, could be done tonight if you are girl who uses computer besideFacebook, online banking, checking emails and internet.
Option 5 which is not above but you will encounter it as there will be several guys sending you pm to help you fix it asking your email address or phone numbers.
Either way good luck with you assignment.
Passionate Dreamer,
YekloYatri