The C Drive on my computer is full. I keep deleting things, but it still says full. Help?

I have deleted a least 30GB of stuff and whe i update it, the screen shows i've done nothing. The computer still runs at the same speed.....slow. I have tried going through the C Drive and directly deleting things, and sometimes it lets me or an error saying i need permission pop's up.I've gone through the performance info i my control pannel and doing disk clean up, also deleting things, again..nothing. My computer says I have 6-7 GB left, and I need about 40 to be free. I have tried everything I can think of. I need a computer genius. Please help me if you can.

The C Drive on my computer is full. I keep deleting things, but it still says full. Help?
You should try deleting more stuff....If it doesn't work try reinstalling windows then only install what you half to...or go buy a bigger hard drive
Reply:I'm assuming you use Windows. Sometimes when you uninstall programs through "add or remove programs" (or "programs and features" if you have Vista), some files get left behind. If I were you, I would go searching the Program Files folder on the C drive and delete any trialware or files from programs you already uninstalled. If you have any problems deleting files, or if you get any errors, try deleting them in safe mode. Be careful not to delete any necessary files! I would also create a restore point before you begin...just in case. If it's speed you're worried about, try defragging the system (Start | All Programs | Accessories | System Tools | Disk Defragmenter). Or, make sure there are not a lot of files in the startup folder of the Start Menu. This can also slow down your PC. If your internet is slow and you use Internet Explorer, try removing any toolbars you added on.





In response to Jason H's answer, here's a link to a great program that will scan for and delete any temporary files on your PC. I highly recommend it:





http://www.download.com/Advanced-Disk-Cl...





If this doesn't work, you can do it manually, like Jason H mentioned above.


If you have any questions, respond, and I may be able to answer them.
Reply:Just a hunch here but try turning off the pc, opening the case and re-seating all of your cables one at a time. especially the ide cables. Pull each one out then re-plug them. This may just fix your problem. If not, start trying to transfer your important files to a back-up source such as another hard drive and do it soon cause this may be an indication of a near future hd failure. I hope this helps. J
Reply:log ogg of your current username and log back on with user name administrator. if it requires a password try administrator. Then run a search for C:/temp or *.tmp and delete all of them. defrag. and you shuld have cleared some space.
Reply:Disable restore, and then reboot and reenable it