Does it is ok to have a 14GB Windows folder

[abhi123tri]

i've windows XP Pro SP3 installed in my pc.i've 24.8GB of total space in my C:/ drive(80GB hard disk) now-a-days i'm facing low space problem in C:/ drive.i want to ask that is it o.k. to have a windows folder with a size of 14GB.
i've already performed disk Clean up.
FREE SPACE IN MY DRIVES->
C:/ 1.91(major Large folders are given below
Downloads: 1.57
Documents: 2.21
Programs: 2.89
Windows: 13.9

D:/ 1.73
E:/ 0.84
TOTAL:4.48

now please suggest me how can i increase space in my C:/ drive

[Ernesto4]

It is proper if you have essential software in your system. Program files has installed software in your system which you can clear up by removing them. Then comes Downloads in which you can delete the files. They are the download from the internet. Try to run CCleaner. This will clear up your all registry files and temp folders and give you some space.