Windows 2003 Server Activation

Hi, I have a question regarding the Windows 2003 Server Activation, I work in a new company, I installed 2003 standard edition on a server, and then a crash occured, so I had to install it again, and when it asked me for activation I tried but the system denoted me that the number of activation has been exceeded, I want to know how many times activation is allowed for this standard edition, and as we all know, crashes always happen with Microsoft Windows. so how can I solve this problem, cause sure I will face it again, I want to know how you deal with this issue?