Access Priviledges

Alright so, recently, my computer died because I left it on for 4 weeks straight. :D? But anyhow, I got some guy to 'fix' it and all he did was install a new processor and motherboard. What he also did was install Windows XP Professional. Now, what's the big deal? All my profiles are gone and I'm "Owner." I can't get to my old documents folder which were under the old username/profile. Any suggestions?

A computer shouldn't die from running for 4 weeks straight, unless something in the cooling system dies or it wasn't adequately cooled in the first place. The guy you took it to was clearly a complete hack who did a half-assed job, taking the "replace everything" approach to problem diagnosis, and ripping you off in the process. He then installed what will probably turn out to be a pirated version of XP Professional that will fail Microsoft's Genuine Advantage checks (needed when you download anything official, like Windows Defender, or visit Windows Update) because he's using a leaked volume license key. If he was a professional repair man, you've good grounds to dispute his charges and report him to whatever trading standards bodies operate in your country/area. If he wasn't a professional, you've learned a valuable lesson.

Now, you may still be able to get your documents back, provided he hasn't wiped the hard drive. Check the folder C:\Documents and Settings\ to see if your old profile name(s) are still in there. If so, you should be able to copy the files back into your new profile folder. You may have to take ownership of the files (see Windows Help and Support for how to do this). If he wiped your hard drive before reinstalling, the data is pretty much gone.