How to increase free disk space on my C drive?

i have a windows xp SP3 64-bit system. my disk space in C drive is 25GB i have only installed program files like the OS, PC suite, video converter, Photoshop, picasa etc. on this drive and all my games, pictures, music etc are on other drives. but still almost every week m disk space goes on reducing and i have to... show more i have a windows xp SP3 64-bit system. my disk space in C drive is 25GB i have only installed program files like the OS, PC suite, video converter, Photoshop, picasa etc. on this drive and all my games, pictures, music etc are on other drives. but still almost every week m disk space goes on reducing and i have to clean it up. i have used disk cleaner many times but still the free space doesn't increase. what can i do to increase my disk space. and also i have created 3 users on this PC.
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