I have been running Windows 7 on a machine I built for almost a year. Back in December, I began to receive very frequent crashes and blue screens. I re-installed windows, and the problem went away. A few weeks ago, I started getting them again. After cleaning out my CPU's heat sink, the problem went away until yesterday. Since then, I now receive a blue screen or crash seemingly at random. The errors I receive are as follows. 0x0000004E, 0x0000000A, and 0x0000003b. The messages I have seen are irql_not_less_or_equal, memory_management, and PFN_list corrupt. I am thinking that either my Board is going out, or I have bad memory. I use my computer for several hours on a daily basis and would really like any help I can get.
System-
GPU - Sapphire AMD Radeon HD 6770
CPU - AMD Athlon X2 3.0 GHz Dual-Core
Motherboard - Biostar A780L3L
Memory - 4036 MB of Crucial Memory. Don't know specifics.
If any more information is needed, please let me know.

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