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My original file does not usually open at all and if i am lucky enough to open it the frame rate is increadibly slow and i can only run around i cant pick up things nor break them and the world does not load al the way. if i open a new file it will let me play for about five minutes and then crash. The crash report below is from my orginal file.

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]
Time: 3/23/13 9:16 PM
Description: Sending packet
java.lang.NullPointerException
at ch.b(SourceFile:107)
at ch.a(SourceFile:39)
at jh.b(SourceFile:430)
at gu.b(SourceFile:669)
at gu.a(SourceFile:79)
at bjk.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:480)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjh.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at ch.b(SourceFile:107)
at ch.a(SourceFile:39)
-- Packet being sent --
Details:
Packet ID: 4
Packet class: fh
Stacktrace:
at jh.b(SourceFile:430)
at gu.b(SourceFile:669)
at gu.a(SourceFile:79)
at bjk.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:480)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjh.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)
-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 114950872 bytes (109 MB) / 811114496 bytes (773 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 982024 (54993344 bytes; 52 MB) allocated, 982024 (54993344 bytes; 52 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 57373 (3212888 bytes; 3 MB) allocated, 57373 (3212888 bytes; 3 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.