My new AMD 1.1Ghz and Gigabyte MB combo keeps locking up, please help!!!

[goahead]

Ever since I replace my computer with AMD 1.1Ghz Retail Processor and Gigabyte 7ZX Motherboard, my computer locks up EVERY 5 mins!!! I have to turn off the computer and on again to unlock it.
This is driving me insane! I thought I had a defective board and sent it back to Gigabyte company. After waiting for a month, they sent back the "fixed" MB, but it's doing the same thing all over again.

Could it be that the motherboard is still a defect? Or possibly AMD Processor is bad. I don't know.

I called Gigabyte 3 times, and Emailed them 10 times, they NEVER respond. Their service is one of the worst I've ever dealt with.

 

[KGB]

We need your full system specs as well as OS and a complete description of your problem in order to help.

 

[goahead]

Okay. My system is put together by myself.
AMD 1.1Ghz, 128Mb 133SDRAM, Gigabyte GA-7ZX MB, Hercules MX Video Card, Plextor Ultra SCSI 40X CD Drive, and Adaptec UW SCSI Adaptor. Windows 98.

The reason why I did not post full sys specs was because everything was working absolutely perfect until I replaced the MB & Processor. Previous MB: ABit BX-6 V.2.0 and Pentium III 450Mhz.