please help get rid of "Smart Guard" (fake anti-virus)

my laptop is infected by "Smart Guard Protection". it blocked everything. i cant run internet browser, mbam, dds, gmer. (i read the instruction, but i cant get the programs to run. please tell me what to do so i can provide the logs).

dell inspiron 1525
windows vista home premium
2007
service pack 2
32 bit
intel Pentium dual cpu T2390 @ 1.86ghz 1.87 ghz
2.0 gb ram

thanks