see - you can cope ;)
800x600 at 60Hz is absolutely fine
resolution is the number of dots used to make the picture
because the screen is a fixed size - the more you cram in the clearer the pic tends to be (within reason)
it all depends on your eyes - on a 15" screen 800x600 is fine - personally I like the next one up at 1024x768 - you get more content on screen - but words can be harder to read - best way is try
the refresh rate is the number of times the screen is "rebuilt" every second to show movement
the newer old style "propper" CRT monitors were so fast that you could sometimes see the screen flicker
so you could increase the refresh until it was too fast to see.
the trouble is that your graphics card (the thing the screen plugs into which takes info from the PC and shows it on screen)
has to calculate more dots more times a second - so there is generally a compromise to get the best picture without exhausting the card - which will slow the PC
http://www.helpwithpcs.com/tipsandtricks/chang ing-screen-resolution-win-xp.htm
But If your old monitor is dead - I'm guessing tour PC is no chicken either?
so I'm thinking it's coincidence - try this
look at your drive(s?) in my computer - how much free space?
you should have about 20% free on C:\ for windows to work well.
uninstall any progs you don't use any more
if you have 1000s of photos or music files - you should think about archiving them to CD or an external HDD
it's also worth downloading and running
http://www.ccleaner.com/downloadbr />
it will clean out any rubbish that's accumulated.
then
check