Computer keeps freezing on startup

also see brinks tutorial here How to Repair Windows 7 System Files with System File Checker >>> SFC /SCANNOW Command - System File Checker - Windows 7 Forums and follow his instructions

i meant check the clock settings(time and date) in the system tray :)

if you have problems running the scan follow this tutorial >>> How to Check / Repair the Windows System Files from a Command Prompt at Boot >>> SFC /SCANNOW : Run in Command Prompt at Boot - Windows 7 Forums

its wise to run sfc at least 3 times have you run a disc check on the hard drive? right click on the drive in my computer click on properties click the tools tab and click on disc check windows will schedule a scan for next reboot. when it has reboot pc and let windows scan disc.

well you have done most of what i would do check your windows updates, driver updates (from the manufacturers websites is always best ) check the video card seating and your ram (un-seat and reseat is always good) check all connections on the m/board from the power supply you could always buy yourself a new battery for the motherboard if you wanted and replace.

if the problem freezing has ceased then i would see how it fairs for a while. keep an eye on the system errors and see if they decrease over time some events you will not need to worry about i have them on my pc i investigate the critical ones 9/10 its driver errors i find. windows 7 seems to repair itself quite well. if you feel like a reinstall then that is your decision if you are happy to start again.