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hi
read this information particularly about system restore using 15% of hard drive space
see if this program helps you to ascertain what is taking up the space
http://www.jam-software.com/treesize_personal/
system restore by default will take up to 15% of the hard drive capacity
you may like to diminish that amount
http://www.vistax64.com/tutorials/76227-system-restore-disk-space.html
http://www.vista4beginners.com/System-Restore-Space-Used
also use disk cleanup
http://windows.microsoft.com/en-us/windows-vista/Delete-files-using-Disk-Cleanup
The More Options tab is available when you choose to clean files from all users on the computer. This tab includes two additional ways to free even more disk space:
- Programs and Features. Opens Programs and Features in Control Panel, where you can uninstall programs that you no longer use. The Size column in Programs and Features shows how much disk space each program uses.
- System Restore and Shadow Copies. Prompts you to delete all but the most recent restore point on the disk.
also scan for malware
download update and scan with the free version of malwarebytes anti-malware
http://www.malwarebytes.org/mbam.php
and read this microsoft information on optimizing windows
http://windows.microsoft.com/en-US/windows-vista/Optimize-Windows-Vista-for-better-performance