Regular problem with video playback & audio video sync

So, I am regularly having two problems (I wonder whether they are connected) that I cannot solve and am hoping someone can tell me if I am out of luck or if I need to do something or add something.
For example, because it happened again today. These are details about the file stuff:
Type:AVI
Bit Rate:133kbps
Dimensions:624x352
Audio format: LameMP3
Frame rate: 23 frames/second
Data Rate: 1131 kbps
Video Sample Size: 12 bit
Video Compression: XVID
First Problem: If I play the file - I use Media Player Classic - it plays fine. Open it in Windows Media Player and it plays fine. Try to edit it in Premiere and the file loaded into Premiere is filled with what I believe are called audio video sync problems, so I have to constantly unlink audio and video and adjust it. It loads and does not need to conform.
I have the same problem on my laptop(Windows XP Home) and desktop (XP Pro), the desktop with twice the RAM. I have the K-lite Mega codec pack installed. I would call myself a beginner when it comes to video editing. I understand generally what codecs are but I am not capable to making any tweaks to the K-lite Mega codec pack (if I should have) so it is setup as installed.
Second Problem: The video in the playback box never plays back normally. I have tried adjusting the playback settings: have changed the aspect ratio between the software and harware option and adjusted between the three desktop display options. Occasionally it is "ok" but most of the time not and never just normal.
Any help is much appreciated.
Thank you.

I tried this already and then we had a blackout so going to try again and hope it goes through before a second one...lol
Hello:
Thank you Robert J. Johnston, the_wine_snob, Paul_LS and SteveGrisetti for your help so far.
So this is where I am at now:
Files all seem to be of the same type, so I will just say "the file" for the one I am working with right now.
Loaded file into VirtualDub. I like that program. Well done, whoever made it. Did some basic cutting of unwanted stuff. Saved as AVI. Saved both a Direct Stream Copy and a Full Processing Copy.
Opened the FP copy in Premiere Elements and it plays without audio sync problems that I can see. Have edited it some so far and still no problems.
Before I do any more editing work, I decided to save it (SHARE) in different formats to see what happens.
Goal: Looking for no audio sync problems. Best quality I can get with a 1GB file size limit.
Saved as DV-AVI: plays fine. no audio sync probelms. love the video quality. 2.95GB, so too big
Saved as Flash: Do not see any audio sync problems. Do NOT like the quality (flips back and forth between clear and all pixely (is that a word). 32 MG
Saved as Mpeg: Media Player won't play it (thought Media Player with KL Mega Codec played everything?) (It loads it but doesn't play?); Quicktime won't play it. Windows Media Player just did. Do not see any audio sync problems. Like the video quality. 631 MB.
Saved as Windows Media: Do not "think" there are any audio sync problems; if there are, they are very subtle. Not crazy about video quality. Better than flash video option though still flickers between two types of qaulity (if that makes sense) . 52MB
Any suggestions as to what I should do at this point to meet my stated goal. I assume [share]ing is what I should do? Is there any exporting or any other options I do not know about. Without your help I figure I will Share to MPEG? Not sure why Media Player won't play it and Windows Media Player will?
Any thoughts on the best choice for me? Thanks for your help.

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