原来所有文件占16GB. 不到一个月现在是33GB. 我自己的文件都放在D盘。 我查了一下，发现主要是\windows 占用空间的增加。用过disk clean的软件。效果不大。
Not good Chinese as I learned most computer terms in English. Sorry. I have Vista pre-installed. After I installed all software it used 16GB. Now it is 33GB. I save all my files on d: drive. Also I cleaned temp files using disk clean software. I checked and found it is \windows directory that contribute most of the usage space increase.