By reset mode, do you mean you are pushing the reset button. One should not use that button when in Windows unless a normal shut-down and Ctrl-Alt-Delete do not work. If a computer “wedges” (locks-up, etc.) use Ctrl-Alt-Delete first and try to end the non-responding task, press the reset button second, and use the power switch/pulling the power cord as a last resort. The reset button and power switch/cord methods will occasionally corrupt files and may require a complete Windows, etc. install.
What motherboard, BIOS, and hard disk do you have? Do you see any clusters that are marked bad when Scandisk first starts to scan? The beeps are quite unusual after a computer goes through the BIOS post and may indicate intermittent memory, motherboard, or power supply problem, but those kinds of problems usually (and rarely) cause random beeps. Or, are you really hearing the hard disk drive and the beeps more like a clinking sound? Clinks from a Seagate drive usually indicate a drive that is about ready fail or has failed. Try running an anti-virus program, check your cables, reseat the memory, pull all boards except video, and disconnect all drives except the hard disk. Larry