You may have what appears to be just a small computer problem or task -- NOT a boot problem, sluggishness, a virus, blue screen errors, broken or failed piece of hardware, etc. Perhaps you want to create a slipstream CD... or maybe you want to install a Windows XP "virtual machine" on a Windows 7 computer. The number of small computer tasks and problems are endless.
Other times it may fall into that "bigger problem" category. Some seemingly simple problems may require a lot of effort, in which case PCR may quote you the standard repair rate. Based on the symptoms you describe, if PCR initially quotes you a "small problem" price, but later concludes that it is a larger problem that can only be fixed at the regular repair price, then you are free to say "no thanks", and there would be NO CHARGE at all. So there is no risk.