It would be nice to know what Operating system you are using?
...and all the system spces.
But, close down every program running in the background using Ctrl - Alt - Delete.
Run Disk Defragmenter and Scandisk (aka Check Disk in XP).
You could also send all the files in the TEMP folder to the recycle bin, but do not delete them just send them there.
Start > Run > Copy and Paste:
Click ok and send all file to the bin, but do not delete them.
Then try and reinstall BHD.