If the virus wipes your bitcoin purse file (this refers to accounts that are on local devices) or can track the password - your money will not be returned. And also here it is necessary to include a rather large amount of occupied space: the whole transaction block (beginning of 2017) is already over 100 GB. This is a consequence of how the crypto currency bitcoin is constructed. Secure synchronization (updating the database) will also take some time, which will affect the usability of the operation.
If you figured out why you need bitcoin and decided to invest money, you may face a drop in prices due to lack of demand. The cost of crypto currency is determined by capitalization and demand (and only by them) - this is a consequence of how bitcoin works.
Virtual money bitcoin does not support refunds for password theft or deception. Nobody has sufficient capabilities and authority to conduct a reverse bitcoin transaction, unless you are returned by the one who appropriated them.