Black Candles are bearish lines in candlestick and candlevolume charts. They signify that the closing is lower than opening for that time period.
CHKDSK, short for Check Disk, is a utility that checks the integrity of the files and file structure of your hard disk. I'll walk you through it. I have disk problems and you said I should run CHKDSK. Great.
The Disk Cleanup utility removes unnecessary files to free up space on the disk drive of your choice. To run Disk Cleanup on a Windows 7 computer, follow these steps: Click Start. Click All Programs | Accessories | System Tools | Disk Cleanup. Select Drive C from the drop-down menu. Click OK. Disk cleanup will calculate the free space on your computer, which may take a few minutes. After the calculation is complete, you should see a dialog box that looks similar to the following: