[feralicious]

How long has it been since you've done a full reformat? If you have everything backed up I would go for it. I usually do it on my pc about once or twice a year, it gets rid of all the gunk from old programs.

And if you have a big enough HDD, I would partition it so you have about 15gb for your C drive where you'll put your operating system and programs, then use the rest for your files. Then you don't have to worry about backing stuff up if you need to reformat since you only have to do that partition.