Problem in Loading of Windows XP Pro

Hello, could I get help regarding my Windows XP Pro? Whenever I load it, it takes so much of my time. I timed it and it loads for about 7-8 minutes. There are no problems after I load it. It's just that it takes too much time loading.
I tried the following tactics to try and solve this hassle: running the anti-virus softwares, Acronis backup and Highjack. However, nothing was found and it says that it is safe. Could somebody check it out? Maybe you could find something I failed to see.
