I assume that your objective is to get the best possible 1st deposit bonus. As you have said that you have never made a deposit to PokerStars, you are not (so far as I can see) doing anything that PS could have any complaints with. A 1st deposit is a 1st deposit - doesn't mater how many time you install / reinstall the software so far as I can see.
Of course, if you had already made a deposit in any form to PS from the same PC, that would be a different issue. If you've not deposited before from that PC (or any other PC for that matter) then go ahead - I can't see any problems.