i want to upgrade, please, help me!

i have an abit kt8 mobo, 2x128 pc133 sdram, duron 750, msi gf2ti64mb.
i have low benchmark scores (3dmark2001: 3128), and some games doesn't perform well (rally trophy)
i think the problem shouldn't be the vidcard, but the processor.
now i want to upgrade the processor, but without buying new mobo and ddr rams (i don't have so much money now)
the mobo has a via kt133 chipset, and can't run on 133mhz fsb. so i can't normally use a new athlon or xp, only with 100mhz fsb.
can i unlock the multiplier of these processors, to reach their nominal speeds with 100 mhz and higher multiplier? (for exmaple, can i run an 1.2ghz athlon-c 133mhz on 12x100mhz?)
it would be good, because then i could use the better processor later, when i'll have money to replace the mobo and rams.
if not, can i go with the 100mhz atlon?
and which is faster: a 1.2ghz old athlon with 100mhz fsb, or a new duron 1.2ghz with 100mhz and sse?
the other question is that: should i replace my globalwin fop32 cooler, or should i replace it?
the duron went up to 50°c in the summertime.
what do you suggest? what to buy, what's the best buy in my case?
third question, if anyone has a msi 8855 gf2ti card, please help me, i can't enable the virtual desktop function in the 3d!turbo software, and msi doesn't give any answer to me!
thaks for all who help!

You can get a 1400 athlon with 100 FSB or a duron up to 1300 with a 100 FSB. Check out Pricewatch.com for the lowest prices. If you aren't overclocking the FOP32 will be ok but I would reccomend a SVC Golden gate from SVCompucycle.

i don't want a 1400, because i know the limits of my fop32...
well, if i don't have to change it, i'll go with a 1200.
but what's the faster: the new duron with optimizations and sse, or the old athlon with it's 256k cache?

OK why not try to manipulate your multiplier? Try here.

well, that was my question.
can i unlock the 1400c athlon, and run it on 14x100mhz? my abit kt7 board doesn't support 133mhz fsb. maybe i could reach 110-115, but not more.
is the athlon c 1400 running stable with 14x100???
or: can i run a 1400c on 12x100? (just temporarily, until i'll have enough money to buy a better mobo and rams, and a cooler)

thechnically a 1.4 shouldnt run that much hotter (if any ) than a 1.2

why don/t you try with 110X12.5
and try too download the new bios of abit

i can only try it after i bought it. and if it doesn't work? what do i do then?
i want to know, if it's work or not, BEFORE i buy something.
the athlon-b with 100mhz fsb is really rare and expensive today. a 133mhz athlon-c would be cheaper and easier to get, but what, if it doesn't work?
maybe 110mhz is not stable...

and nobody answered: can i safely unlock an athlon-c???

i think that safe
you can try it by up the multlipier