Windows 7 64 bit hangs at welcome screen


I've had windows 7 ultimate 64bits for a year now on my brand new pc, and today he starts and slowly ... around 35 mins to show desktop and will take forever if i click anything. I restarted in safe mode and it works perfectly, there are no exclamation points on the device manager. The only major change i have done but not recently was my video card from Nvidia to raddeon saphire. Can anyone help me fix this issue please
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  1. If it takes that long in normal boot, then you are most likely looking at malware problem. But first, I would do some general maintenance. Run defrag and chkdsk. Then run hardware diagnostics, specifically for the hard drive. SeaTools for Seagate, DFT for hitachi. etc.
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