You've ordered something from a company that goes into administration before fulfilling your order. Whether you get your money back depends on the company's exact situation, and how far along your order's got since being placed.
But nothing's guaranteed, which is why routes such as credit card protection, detailed below, are so important.
If a company's in administration, it means it can't provide your goods or services, and the management's no longer in control. Yet it doesn't necessarily mean it's closed down completely.
The administrator's job's to maximise the value from selling off the company, and if keeping it as a going concern in order to sell it does that, then it'll keep trading. That may mean you can simply get a refund, or you receive the product as normal.
Otherwise, to be in with a chance of getting your cash, you'll have to apply to the administrator, not the company, and any cash left after paying the secured creditors and staff will be split between everyone who's submitted a claim.
If you need to get a refund through the administrators, don't count on getting all your money back. You may be lucky to get anything. If you do, it's often just a few pence per pound owed.