I charge £25 per hour for work done in the workshop, or £35 per hour for a call-out to your home.
Possibly, but bear in mind that a nasty virus infection may only take an hour for me to cure, but it can lose you friends, not to mention hours of your own time if you try to fix it yourself!
A tuneup, which make your PC much faster, could also take one hour.
A full reinstall of Windows including all manufacturers driver software would take 3 hours and cost £75 (retrieving your data can take longer depending on the size of your files - how many pictures you have etc.)
A larger hard drive in a Mac laptop typically takes two hours plus the cost of the drive (this includes the cloning of your old drive onto the new one).
Business rates vary according to the level of service and response time required, but are typically £45 per hour, less for work done in my workshop.
Daily or weekly rates are negotiable, depending on length of contract.