PD 6.2 is compatible with your TX. I would suggest using the 4.x version of PD you currently are using. 6.2 has reported data loss issues, see the posts in the forums for that issue.
If your OS version on the new PC is Win7 is 64 bit, you will need the 64 bit drivers and can get them here; http://forums.hpwebos.com/t5/Windows-HotSync/64-Bit-Palm-Desktop-Drivers-are-HERE/m-p/337516
Install the 4.x version and sync. Once your data is in PD, I would suggest you export your data from PD for backup purposes.
The best way to preserve your data is to export the data in each category in Palm Desktop to a separate folder on your PC.
Create a new folder on your PC somewhere that is convenient. Name it something like Palm Desktop Data. Click on the link below and follow the instructions on that page for the export procedure.
http://kb.hpwebos.com/wps/portal/kb2/common/article/28734_en.html
Make sure you select all for the range in the export window.
With the data saved in the folder you created, make a copy of that folder and save to a flash drive, cd-rw or external hard drive.
Anytime you make a change in Palm Desktop, export the data that was changed to that folder and save again to the external media.
With this process you can always import the data back into Palm Desktop anytime you have a problem with the data in Palm Desktop or if your computer/hard drive/device crashes.
For reference purposes, click on the following link for the support page for your device on the kb.hpwebos.com webpage.
http://kb.hpwebos.com/wps/portal/kb/na/tungsten/tx/unlocked/home/page_en.html
There are links on the page to the user guide, troubleshooting, how to's, downloads, etc.
