If you are stuck with a Windows operating system, you might need some tools for basic needs, these are all free:
for brute/regexp search in .pro and .rux files: WinGrep
Windirstat is quite a useful visualisation tool to clean up your drives/servers. A picture is worth a thousand words, take a look at the screenshot.
It was first developed for KDE: kdirstat
A few more tools from lifehacker
And finally, not a desktop tool per se, but quite useful to share files quick, easy and secure: http://drop.io